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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 19, 2019 USD ($) | Jun. 18, 2019 USD ($) | Apr. 03, 2019 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | May 31, 2018 USD ($) | Sep. 23, 2016 EUR (€) | Oct. 01, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt financing costs |  |  |  |  | $ 2,238,000 |  | $ 1,494,000 |  |  |  |
Amortization of debt financing costs recognized as interest expense |  |  |  |  | 1,094,000 |  | 1,256,000 | $ 1,130,000 |  |  |
Balance of unamortized debt issuance costs |  |  |  |  | 2,478,000 |  | 2,895,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 1,008,067,000 |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | 262,297,000 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 734,528,000 |  |  |  |  |  |
Short-term borrowings |  |  |  | $ 153,635,000 | 220,000,000 |  | 153,635,000 |  |  |  |
The Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Balance of unamortized debt issuance costs |  |  |  |  | $ 2,478,000 |  | 2,895,000 |  |  |  |
Debt Instrument, Description |  |  |  |  | In October 2008, Woodward entered into a note purchase agreement relating to the Series D Notes, due on October 1, 2018. On October 1, 2018, Woodward paid the entire principal balance of $100,000 on the Series D Notes using proceeds from borrowings under its revolving credit facility. In April 2009, Woodward entered into a note purchase agreement relating to the Series F Notes, which were due on April 3, 2019. On April 3, 2019, Woodward paid the entire principal balance of $43,000 on the Series F Notes using proceeds from borrowings under its revolving credit facility. On October 1, 2013, Woodward entered into a note purchase agreement relating to the sale by Woodward of an aggregate principal amount of $250,000 of its senior unsecured notes in a series of private placement transactions. Woodward issued the Series G, H and I Notes (the “First Closing Notes”) on October 1, 2013. Woodward issued the Series J, K and L Notes (the “Second Closing Notes” and together with the Series D Notes, the Series F Notes and the First Closing Notes, collectively the “USD Notes”) on November 15, 2013. On September 23, 2016, Woodward and the BV Subsidiary each entered into note purchase agreements (the “2016 Note Purchase Agreements”) relating to the sale by Woodward and the BV Subsidiary of an aggregate principal amount of €160,000 of senior unsecured notes in a series of private placement transactions. Woodward issued €40,000 Series M Notes. The BV Subsidiary issued (a) €77,000 aggregate principal amount of the BV Subsidiary’s Series N Senior Notes (the “Series N Notes”) and (b) €43,000 aggregate principal amount of the BV Subsidiary’s Series O Senior Notes (the “Series O Notes” and together with the Series M Notes and the Series N Notes, the “2016 Notes”).On May 31, 2018, Woodward entered into a note purchase agreement (the “2018 Note Purchase Agreement”) relating to the sale by Woodward of an aggregate principal amount of $400,000 of senior unsecured notes comprised of (a) $85,000 aggregate principal amount of its Series P Senior Notes (the “Series P Notes”), (b) $85,000 aggregate principal amount of its Series Q Senior Notes (the “Series Q Notes”), (c) $75,000 aggregate principal amount of its Series R Senior Notes (the “Series R Notes”), (d) $75,000 aggregate principal amount of its Series S Senior Notes (the “Series S Notes”), and (e) $80,000 aggregate principal amount of its Series T Senior Notes (the “Series T Notes”, and together with the Series P Notes, the Series Q Notes, the Series R Notes, and the Series S Notes, the “2018 Notes,” and, together with the USD Notes and 2016 Notes, the “Notes”), in a series of private placement transactions. In connection with the issuance of the 2018 Notes, the Company entered into cross currency swap transactions in respect of each tranche of the 2018 Notes, which effectively reduced the interest rates on the Series P Notes to 1.82% per annum, the Series Q Notes to 2.15% per annum, the Series R Notes to 2.42% per annum, the Series S Notes to 2.55% per annum and the Series T Notes to 2.90% per annum (see Note 8, Derivative instruments and hedging activities). Interest on the remaining First Closing Notes, and the Series K and L Notes is payable semi-annually on April 1 and October 1 of each year until all principal is paid. Interest on the 2016 Notes is payable semi-annually on March 23 and September 23 of each year, until all principal is paid. Interest on the Series J Notes is payable quarterly on January 1, April 1, July 1 and October 1 of each year until all principal is paid. As of September 30, 2019, the Series J Notes bore interest at an effective rate of 3.37%. Interest on the 2018 Notes is payable semi-annually on May 30 and November 30 of each year until all principal is paid.None of the Notes were registered under the Securities Act of 1933 and they may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements. Holders of the Notes do not have any registration rights. All of the issued Notes are held by multiple institutions.Woodward’s payment and performance obligations under the Notes, including without limitation the obligations for payment of all principal, interest and any applicable prepayment compensation amount, are guaranteed by (i) Woodward FST, Inc., Woodward MPC, Inc., and Woodward HRT, Inc., each of which is a wholly owned subsidiary of Woodward, and (ii) in the case of the BV Subsidiary’s Series N and O Notes, by Woodward. Woodward’s obligations under the Notes rank equal in right of payment with all of Woodward’s other unsecured unsubordinated debt, including its outstanding debt under its revolving credit facility. | In October 2008, Woodward entered into a note purchase agreement relating to the Series D Notes, due on October 1, 2018. On October 1, 2018, Woodward paid the entire principal balance of $100,000 on the Series D Notes using proceeds from borrowings under its revolving credit facility. In April 2009, Woodward entered into a note purchase agreement relating to the Series F Notes, which were due on April 3, 2019. On April 3, 2019, Woodward paid the entire principal balance of $43,000 on the Series F Notes using proceeds from borrowings under its revolving credit facility. On October 1, 2013, Woodward entered into a note purchase agreement relating to the sale by Woodward of an aggregate principal amount of $250,000 of its senior unsecured notes in a series of private placement transactions. Woodward issued the Series G, H and I Notes (the “First Closing Notes”) on October 1, 2013. Woodward issued the Series J, K and L Notes (the “Second Closing Notes” and together with the Series D Notes, the Series F Notes and the First Closing Notes, collectively the “USD Notes”) on November 15, 2013. On September 23, 2016, Woodward and the BV Subsidiary each entered into note purchase agreements (the “2016 Note Purchase Agreements”) relating to the sale by Woodward and the BV Subsidiary of an aggregate principal amount of €160,000 of senior unsecured notes in a series of private placement transactions. Woodward issued €40,000 Series M Notes. The BV Subsidiary issued (a) €77,000 aggregate principal amount of the BV Subsidiary’s Series N Senior Notes (the “Series N Notes”) and (b) €43,000 aggregate principal amount of the BV Subsidiary’s Series O Senior Notes (the “Series O Notes” and together with the Series M Notes and the Series N Notes, the “2016 Notes”).On May 31, 2018, Woodward entered into a note purchase agreement (the “2018 Note Purchase Agreement”) relating to the sale by Woodward of an aggregate principal amount of $400,000 of senior unsecured notes comprised of (a) $85,000 aggregate principal amount of its Series P Senior Notes (the “Series P Notes”), (b) $85,000 aggregate principal amount of its Series Q Senior Notes (the “Series Q Notes”), (c) $75,000 aggregate principal amount of its Series R Senior Notes (the “Series R Notes”), (d) $75,000 aggregate principal amount of its Series S Senior Notes (the “Series S Notes”), and (e) $80,000 aggregate principal amount of its Series T Senior Notes (the “Series T Notes”, and together with the Series P Notes, the Series Q Notes, the Series R Notes, and the Series S Notes, the “2018 Notes,” and, together with the USD Notes and 2016 Notes, the “Notes”), in a series of private placement transactions. In connection with the issuance of the 2018 Notes, the Company entered into cross currency swap transactions in respect of each tranche of the 2018 Notes, which effectively reduced the interest rates on the Series P Notes to 1.82% per annum, the Series Q Notes to 2.15% per annum, the Series R Notes to 2.42% per annum, the Series S Notes to 2.55% per annum and the Series T Notes to 2.90% per annum (see Note 8, Derivative instruments and hedging activities). Interest on the remaining First Closing Notes, and the Series K and L Notes is payable semi-annually on April 1 and October 1 of each year until all principal is paid. Interest on the 2016 Notes is payable semi-annually on March 23 and September 23 of each year, until all principal is paid. Interest on the Series J Notes is payable quarterly on January 1, April 1, July 1 and October 1 of each year until all principal is paid. As of September 30, 2019, the Series J Notes bore interest at an effective rate of 3.37%. Interest on the 2018 Notes is payable semi-annually on May 30 and November 30 of each year until all principal is paid.None of the Notes were registered under the Securities Act of 1933 and they may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements. Holders of the Notes do not have any registration rights. All of the issued Notes are held by multiple institutions.Woodward’s payment and performance obligations under the Notes, including without limitation the obligations for payment of all principal, interest and any applicable prepayment compensation amount, are guaranteed by (i) Woodward FST, Inc., Woodward MPC, Inc., and Woodward HRT, Inc., each of which is a wholly owned subsidiary of Woodward, and (ii) in the case of the BV Subsidiary’s Series N and O Notes, by Woodward. Woodward’s obligations under the Notes rank equal in right of payment with all of Woodward’s other unsecured unsubordinated debt, including its outstanding debt under its revolving credit facility. |  |  |  |  |
Debt Instrument, Covenant Description |  |  |  |  | The Notes contain restrictive covenants customary for such financings, including, among other things, covenants that place limits on Woodward’s ability to incur liens on assets, incur additional debt (including a leverage or coverage based maintenance test), transfer or sell Woodward’s assets, merge or consolidate with other persons and enter into material transactions with affiliates. Under the financial covenants contained in the note purchase agreement governing each series of the Notes, Woodward’s priority debt may not exceed, at any time, 25% of its consolidated net worth. Woodward’s Leverage Ratio cannot exceed 4.0 to 1.0 during any material acquisition period, or 3.5 to 1.0 at any other time on a rolling four quarter basis. In the event that Woodward’s Leverage Ratio exceeds 3.5 to 1.0 during any material acquisition period, the interest rate on each series of Notes will increase. For the Series G, H, I, J, K, L, M, N, and O notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2016. For the 2018 Notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus (i) 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2018 and (ii) 50% of the net cash proceeds received by Woodward on or after May 31, 2018 from the issuance of capital stock, other than issuances pursuant to employee stock option or ownership plans. | The Notes contain restrictive covenants customary for such financings, including, among other things, covenants that place limits on Woodward’s ability to incur liens on assets, incur additional debt (including a leverage or coverage based maintenance test), transfer or sell Woodward’s assets, merge or consolidate with other persons and enter into material transactions with affiliates. Under the financial covenants contained in the note purchase agreement governing each series of the Notes, Woodward’s priority debt may not exceed, at any time, 25% of its consolidated net worth. Woodward’s Leverage Ratio cannot exceed 4.0 to 1.0 during any material acquisition period, or 3.5 to 1.0 at any other time on a rolling four quarter basis. In the event that Woodward’s Leverage Ratio exceeds 3.5 to 1.0 during any material acquisition period, the interest rate on each series of Notes will increase. For the Series G, H, I, J, K, L, M, N, and O notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2016. For the 2018 Notes, Woodward’s consolidated net worth must at all times equal or exceed $1,156,000 plus (i) 50% of Woodward’s positive net income for each completed fiscal year beginning with the fiscal year ending September 30, 2018 and (ii) 50% of the net cash proceeds received by Woodward on or after May 31, 2018 from the issuance of capital stock, other than issuances pursuant to employee stock option or ownership plans. |  |  |  |  |
Debt Instrument, Payment Terms |  |  |  |  | The Company, at its option, is permitted at any time to prepay all or any part of the then-outstanding principal amount of any series of the Notes at 100% of the principal amount of the series of the Notes to be prepaid (but, in the case of partial prepayment, not less than $1,000 for each the USD Notes and the 2018 Notes and not less than €1,000 for the 2016 Notes), together with interest accrued on such amount to be prepaid to the date of prepayment, plus any applicable prepayment compensation amount. The prepayment compensation amount, as to the USD Notes and 2018 Notes, other than the Series J Notes, is computed by discounting the remaining scheduled payments of interest and principal of the USD Notes and/or 2018 Notes being prepaid at a discount rate equal to the sum of 50 basis points and the yield to maturity of U.S. Treasury securities having a maturity equal to the remaining average life of the USD Notes and/or 2018 Notes being prepaid. The prepayment compensation amount, as to the Series J Notes, generally is computed as a percentage of the principal amount of the Series J Notes equal to 0% after November 15, 2015. The prepayment compensation amount as to the 2016 Notes that is not subject to a swap agreement is computed by discounting the remaining scheduled payments of interest and principal of such notes being prepaid at a discount rate equal to the sum of 50 basis points and the yield to maturity of the German Bund having a maturity equal to the remaining average life of the 2016 Notes being prepaid. The prepayment compensation amount as to a 2016 Notes that is subject to a swap agreement entered into by the holder of such note under which the holder will receive payment in U.S. dollars in exchange for scheduled Euro payments of principal and interest on the Euro denominated 2016 Notes, adjusted for theoretical holder returns foregone on hypothetical reinvestments in U.S. Treasury securities (the “Swapped Notes”) is equal to the excess of an amount equal to the remaining scheduled payments to be paid in respect of such called principal under such swap agreement discounted at a rate equal to 50 basis points and the yield to maturity of U.S. Treasury securities having a maturity equal to the remaining average life of the Swapped Notes being prepaid over the amount of payments in U.S. dollars that would be paid to the holder of the Swapped Note in respect of the called principal under the swap agreement, which amount will be increased or reduced, as applicable, in an amount equal to any net gain or loss realized by the holder of such Swapped Note on swap transactions under such swap agreement as a result of such prepayment. | The Company, at its option, is permitted at any time to prepay all or any part of the then-outstanding principal amount of any series of the Notes at 100% of the principal amount of the series of the Notes to be prepaid (but, in the case of partial prepayment, not less than $1,000 for each the USD Notes and the 2018 Notes and not less than €1,000 for the 2016 Notes), together with interest accrued on such amount to be prepaid to the date of prepayment, plus any applicable prepayment compensation amount. The prepayment compensation amount, as to the USD Notes and 2018 Notes, other than the Series J Notes, is computed by discounting the remaining scheduled payments of interest and principal of the USD Notes and/or 2018 Notes being prepaid at a discount rate equal to the sum of 50 basis points and the yield to maturity of U.S. Treasury securities having a maturity equal to the remaining average life of the USD Notes and/or 2018 Notes being prepaid. The prepayment compensation amount, as to the Series J Notes, generally is computed as a percentage of the principal amount of the Series J Notes equal to 0% after November 15, 2015. The prepayment compensation amount as to the 2016 Notes that is not subject to a swap agreement is computed by discounting the remaining scheduled payments of interest and principal of such notes being prepaid at a discount rate equal to the sum of 50 basis points and the yield to maturity of the German Bund having a maturity equal to the remaining average life of the 2016 Notes being prepaid. The prepayment compensation amount as to a 2016 Notes that is subject to a swap agreement entered into by the holder of such note under which the holder will receive payment in U.S. dollars in exchange for scheduled Euro payments of principal and interest on the Euro denominated 2016 Notes, adjusted for theoretical holder returns foregone on hypothetical reinvestments in U.S. Treasury securities (the “Swapped Notes”) is equal to the excess of an amount equal to the remaining scheduled payments to be paid in respect of such called principal under such swap agreement discounted at a rate equal to 50 basis points and the yield to maturity of U.S. Treasury securities having a maturity equal to the remaining average life of the Swapped Notes being prepaid over the amount of payments in U.S. dollars that would be paid to the holder of the Swapped Note in respect of the called principal under the swap agreement, which amount will be increased or reduced, as applicable, in an amount equal to any net gain or loss realized by the holder of such Swapped Note on swap transactions under such swap agreement as a result of such prepayment. |  |  |  |  |
Percent of the principal amount |  |  |  |  | 100.00% | 100.00% |  |  |  |  |
Percent of debt not exceed net worth |  |  |  |  | 25.00% | 25.00% |  |  |  |  |
The Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  | 3.50% |  |  |  |  |  |
The Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  | 4.00% |  |  |  |  |  |
USD Notes And 2018 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
USD Notes And 2018 Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal payment amount |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Series J Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 3.37% |  |  |  |  |  |
Percent of debt not exceed net worth |  |  |  |  | 0.00% | 0.00% |  |  |  |  |
Series D Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of debt |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Series F Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of debt |  |  | $ 43,000,000 |  |  |  |  |  |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance date |  |  |  |  | Sep. 23, 2016 | Sep. 23, 2016 |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | € 160,000,000 |
Discount rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
2016 Note Purchase Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal payment amount | € |  |  |  |  |  | € 1,000,000 |  |  |  |  |
Series M Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | 40,000,000 |
Series N Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | 77,000,000 |
Series O Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | € 43,000,000 |
2018 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 400,000,000 |  |
Minimum consolidated net worth convenant |  |  |  |  | $ 1,156,000,000 |  |  |  |  |  |
Percent positive net income |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Percent net cash proceeds |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Series P Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | 85,000,000 |  | 85,000,000 |  |
Series Q Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | 85,000,000 |  |
Series R Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | 75,000,000 |  |
Series S Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | 75,000,000 |  |
Series T Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 80,000,000 |  |
Swapped Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Series G, H, I, J, K, L, M, N, And O Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum consolidated net worth convenant |  |  |  |  | $ 1,156,000,000 |  |  |  |  |  |
Percent positive net income |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Notes Payable to Banks [Member] | Series J Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Nov. 15, 2020 | Nov. 15, 2020 |  |  |  |  |
Notes Payable to Banks [Member] | Series J Notes [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 1.25% |  |  |  |  |  |
Notes Payable to Banks [Member] | Series D Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Oct. 01, 2018 | Oct. 01, 2018 |  |  |  |  |
Notes Payable to Banks [Member] | Series F Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Apr. 03, 2019 | Apr. 03, 2019 |  |  |  |  |
Notes Payable to Banks [Member] | Series M Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Sep. 23, 2026 | Sep. 23, 2026 |  |  |  |  |
Notes Payable to Banks [Member] | Series N Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Sep. 23, 2028 | Sep. 23, 2028 |  |  |  |  |
Notes Payable to Banks [Member] | Series O Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Sep. 23, 2031 | Sep. 23, 2031 |  |  |  |  |
Notes Payable to Banks [Member] | Series P Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2025 | May 30, 2025 |  |  |  |  |
Notes Payable to Banks [Member] | Series Q Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2027 | May 30, 2027 |  |  |  |  |
Notes Payable to Banks [Member] | Series R Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2029 | May 30, 2029 |  |  |  |  |
Notes Payable to Banks [Member] | Series S Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2030 | May 30, 2030 |  |  |  |  |
Notes Payable to Banks [Member] | Series T Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2033 | May 30, 2033 |  |  |  |  |
Other Foreign Short-term Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  | $ 0 |  | 3,635,000 |  |  |  |
Foreign Performance Guarantee Facilities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 496,000 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 232,000 |  |  |  |  |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 7,571,000 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 7,571,000 |  |  |  |  |  |
Short-term borrowings |  |  |  |  | $ 0 |  | $ 0 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jun. 19, 2024 | Jun. 19, 2024 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | 262,297,000 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | $ 726,725,000 |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 0.875% |  |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 1.75% |  |  |  |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  | 3.48% |  |  |  |
Balance of unamortized debt issuance costs | $ 802,000 |  |  |  |  |  |  |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  |  |  |  | $ 2,840,000 |  | $ 1,385,000 |  |  |  |
Line of Credit Facility, Expiration Date |  | Apr. 28, 2020 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | 1,000,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity Extension |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  | 266,541,000 |  |  |  |
Short-term borrowings |  |  |  |  |  |  | $ 150,000,000 |  |  |  |
Line of Credit Facility, Minimum Consolidated Net Worth Convenant |  | $ 800,000,000 |  |  |  |  |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  | LIBOR | LIBOR |  |  |  |  |
Effective interest rate |  |  |  |  | 3.01% |  |  |  |  |  |
Debt financing costs |  |  |  |  | $ 2,238,000 |  |  |  |  |  |
Line of Credit Facility, Expiration Date | Jun. 19, 2024 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity Extension | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | 262,297,000 |  |  |  |  |  |
Short-term borrowings |  |  |  |  | 220,000,000 |  |  |  |  |  |
Line of Credit Facility, Minimum Consolidated Net Worth Convenant | $ 1,156,000,000 |  |  |  | $ 1,156,000,000 |  |  |  |  |  |
Line of Credit Facility, Percentage of Positive Net Income as Part of Amended and Restated Revolving Credit Agreement | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |  |
Line Of Credit Facility, Percentage of Net Cash Proceeds as Part of Amended And Restated | 50.00% |  |  |  | 50.00% | 50.00% |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | $ 60,000,000 |  |  |  |  |  |
Leverage ratio |  |  |  |  | 3.50% |  |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.875% | 0.875% |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  | 4.00% |  |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% | 1.75% |  |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series P Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 1.82% |  |  |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series Q Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.15% |  |  |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series R Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.42% |  |  |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series S Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.55% |  |  |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series T Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.90% |  |  |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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