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Long-term Debt (Narrative) (Details) € in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 EUR (€) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) | Apr. 28, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt financing costs |  |  | $ 863 | $ 2,359 |  |
Amortization of debt financing costs recognized as interest expense |  | $ 1,130 | 1,165 | 1,114 |  |
Balance of unamortized debt issuance costs |  |  | 2,091 |  | $ 1,794 |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 1,017,588 |
Outstanding borrowings |  |  |  |  | $ 32,600 |
The Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Covenant, Leverage Ratio, Maximum | 3.5 | 3.5 |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income | 50.00% |  |  |  | 50.00% |
Debt Covenant, Calculations, Period Of Time | rolling four quarter basis | rolling four quarter basis |  |  |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum | 4.0 | 4.0 |  |  |  |
Prepayment, Maximum Percentage of Principal | 100.00% | 100.00% |  |  |  |
Balance of unamortized debt issuance costs |  |  | 2,091 |  | $ 1,794 |
The USD Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Covenant, Maximum Percentage of Priority Debt To Consolidated Net Worth | 25.00% | 25.00% |  |  |  |
Prepayment, Partial Payment Minimum |  | $ 1,000 |  |  |  |
Non Floating Rate Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Prepayment, Make-Whole Amount Computation, Discount Rate Basis Points | 50 | 50 |  |  |  |
Debt Instrument Prepayment Make Whole Amount Computation | computed by discounting the remaining scheduled payments of interest and principal of the USD 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 being prepaid | computed by discounting the remaining scheduled payments of interest and principal of the USD 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 being prepaid |  |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance Date | Oct. 01, 2013 | Oct. 01, 2013 |  |  |  |
Face Amount |  |  |  |  | $ 250,000 |
Floating Rate Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Prepayment Make Whole Amount Computation | computed as a percentage of the principal amount of the Series J Notes equal to (a) 2%, on or prior to November 15, 2014, (b) 1%, after November 15, 2014 and on or prior to November 15, 2015, and (c) 0% after November 15, 2015 | computed as a percentage of the principal amount of the Series J Notes equal to (a) 2%, on or prior to November 15, 2014, (b) 1%, after November 15, 2014 and on or prior to November 15, 2015, and (c) 0% after November 15, 2015 |  |  |  |
Series J Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate | 2.60% |  |  |  | 2.60% |
First Closing Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance Date | Oct. 01, 2013 | Oct. 01, 2013 |  |  |  |
Second Closing Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance Date | Nov. 15, 2013 | Nov. 15, 2013 |  |  |  |
Note Purchase Agreements 2008 and 2009 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value |  |  |  |  | $ 485,940 |
2008 Note Purchase Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance Date | Oct. 01, 2008 | Oct. 01, 2008 |  |  |  |
2009 Note Purchase Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance Date | Apr. 01, 2009 | Apr. 01, 2009 |  |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance Date | Sep. 23, 2016 | Sep. 23, 2016 |  |  |  |
Face Amount | € | € 160,000 |  |  |  |  |
Prepayment, Partial Payment Minimum | € | € 1,000 |  |  |  |  |
Debt financing costs |  |  | 863 |  |  |
2016 Notes Subject to Swap Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Prepayment Make Whole Amount Computation | 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 | 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 |  |  |  |
2016 Notes Not Subject to Swap Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument Prepayment Make Whole Amount Computation | 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 | 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 |  |  |  |
Series M Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face Amount | € | € 40,000 |  |  |  |  |
Series N Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face Amount | € | 77,000 |  |  |  |  |
Series O Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face Amount | € | € 43,000 |  |  |  |  |
Note Purchase Agreement 2013 and 2016 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value |  |  |  |  | 1,046,619 |
Foreign Performance Guarantee Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 10,058 |
Outstanding borrowings |  |  |  |  | 0 |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 7,530 |
Outstanding borrowings |  |  |  |  | 0 |
Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt financing costs |  |  |  | $ 2,359 |  |
Balance of unamortized debt issuance costs, line of credit |  |  | 3,134 |  | 2,259 |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | 1,000,000 |
Outstanding borrowings |  |  | $ 156,700 |  | $ 32,600 |
Credit facility effective interest rate on outstanding borrowing | 2.29% |  | 1.77% |  | 2.29% |
Third Amended and Restated Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  |  |  |  |  | $ 2,014
Revolving Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable Rate Basis | LIBOR | LIBOR |  |  |  |
Debt Covenant, Leverage Ratio, Maximum | 3.5 | 3.5 |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value |  |  |  |  | $ 800,000 |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income | 50.00% |  |  |  | 50.00% |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum | 4.0 | 4.0 |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  |  |  |  | $ 2,259 |
Line of Credit Facility, Expiration Date | Apr. 01, 2020 | Apr. 01, 2020 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 1,000,000 |
Revolving Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis Spread On Variable Rate | 0.85% | 0.85% |  |  |  |
Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis Spread On Variable Rate | 1.65% | 1.65% |  |  |  |

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