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Long-term Debt (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Debt Covenant, Leverage Ratio, Maximum |  | 3.5 to 1.0 |  |
Debt financing costs |  | $ 2,359 | $ 1,297 | $ 1,651
Amortization of debt financing costs recognized as interest expense |  | 1,114 | 1,014 | $ 1,045
Balance of unamortized debt issuance costs |  | 5,521 | 4,276 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,048,808 |  |
Outstanding borrowings |  | 352,430 |  |
The Notes [Member] |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value |  | $ 800,000 |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income |  | 50.00% |  |
Debt Covenant, Calculations, Period Of Time |  | rolling four quarter basis |  |
Cross default provisions related to the Company’s other outstanding debt arrangements in excess of this amount, the occurrence of which would permit the lenders to accelerate the amounts due thereunder |  | $ 60,000 |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum |  | 4.0 to 1.0 |  |
Debt Covenant, Maximum Percentage of Priority Debt To Consolidated Net Worth |  | 25.00% |  |
Prepayment, Maximum Percentage of Principal |  | 100.00% |  |
Prepayment, Partial Payment Minimum |  | $ 1,000 |  |
Non Floating Rate Notes [Member] |  |  |  |
Prepayment, Make-Whole Amount Computation, Discount Rate Basis Points |  | 50 |  |
Debt Instrument Prepayment Make Whole Amount Computation |  | computed by discounting the remaining scheduled payments of interest and principal of the 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 Notes being prepaid |  |
2008 Note Purchase Agreement [Member] |  |  |  |
Issuance Date |  | Oct. 01, 2008 |  |
2009 Note Purchase Agreement [Member] |  |  |  |
Issuance Date |  | Apr. 01, 2009 |  |
2013 Note Purchase Agreement [Member] |  |  |  |
Issuance Date |  | Oct. 01, 2013 |  |
Face Amount |  | $ 250,000 |  |
Debt financing costs | $ 1,297 |  |  |
Floating Rate Notes [Member] |  |  |  |
Debt Instrument Prepayment Make Whole Amount Computation |  | is computed as a percentage of the principal amount of such floating rate 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] |  |  |  |
Variable interest rate |  | 1.58% |  |
First Closing Notes [Member] |  |  |  |
Issuance Date |  | Oct. 01, 2013 |  |
Second Closing Notes [Member] |  |  |  |
Issuance Date |  | Nov. 15, 2013 |  |
Other Foreign Short-term Borrowings [Member] |  |  |  |
Outstanding borrowings |  | $ 0 |  |
Foreign Performance Guarantee Facilities [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 8,619 |  |
Outstanding borrowings |  | 0 |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 40,189 |  |
Outstanding borrowings |  | 2,430 |  |
Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,000,000 |  |
Outstanding borrowings |  | $ 350,000 |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Basis Spread On Variable Rate |  | 0.85% |  |
Chinese Credit Facility [Member] |  |  |  |
Line of Credit Facility, Expiration Date |  | Sep. 01, 2016 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 22,700 | 22,700 |
Outstanding borrowings |  | $ 0 |  |
Chinese Credit Facility, RMB Denominated Loan [Member] |  |  |  |
Variable Rate Basis |  | interest at the prevailing interest rate offered by the People's Bank of China on the date of borrowing, plus a margin equal to 15% of that prevailing rate |  |
Chinese Credit Facility, USD Denominated Loan [Member] |  |  |  |
Variable Rate Basis |  | interest at the lender's cost of borrowing rate at the date of borrowing, plus 3% |  |
Revolving Credit Agreement [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 600,000 |  |
Outstanding borrowings |  |  | $ 210,000 |
Credit facility effective interest rate on outstanding borrowing |  |  | 1.21% |
Amended Revolving Credit Agreement [Member] |  |  |  |
Debt Covenant, Leverage Ratio, Maximum |  | 3.5 to 1.0 |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value |  | $ 800,000 |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income |  | 50.00% |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Proceeds of Issuance of Capital Stock |  | 50.00% |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum |  | 4.0 to 1.0 |  |
Line of Credit Facility, Initiation Date |  | Apr. 28, 2015 |  |
Line of Credit Facility, Expiration Date |  | Apr. 28, 2020 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,000,000 |  |
Outstanding borrowings |  | $ 350,000 |  |
Credit facility effective interest rate on outstanding borrowing |  | 1.44% |  |
Amended Revolving Credit Agreement [Member] | Minimum [Member] |  |  |  |
Basis Spread On Variable Rate |  | 0.85% |  |
Amended Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |
Basis Spread On Variable Rate |  | 1.65% |  |

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