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Credit Facilities and Short-term Borrowings (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Apr. 28, 2015
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,017,588 |  |  |
Outstanding borrowings | 32,600 |  |  |
Debt financing costs |  | $ 863 | $ 2,359 |
Foreign Performance Guarantee Facilities [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | 10,058 |  |  |
Outstanding borrowings | 0 |  |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | 7,530 |  |  |
Outstanding borrowings | 0 |  |  |
Revolving Credit Facility [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,000,000 |  |  |
Credit facility effective interest rate on outstanding borrowing | 2.29% | 1.77% |  |
Outstanding borrowings | $ 32,600 | $ 156,700 |  |
Current portion of outstanding borrowings | 32,600 | 150,000 |  |
Debt financing costs |  |  | $ 2,359 |
Balance of unamortized debt issuance costs, line of credit | 2,259 | 3,134 |  |
Revolving Credit Agreement [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | 1,000,000 |  |  |
Option to increase maximum borrowings to this amount | $ 1,200,000 |  |  |
Line of Credit Facility, Expiration Date | Apr. 01, 2020 |  |  |
Variable Rate Basis | LIBOR |  |  |
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, 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, Maximum | 3.5 |  |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum | 4.0 |  |  |
Debt Covenant, Leverage Ratio Next Two Succeeding Fiscal Quarters Following Material Acquisition, Maximum | 3.75 |  |  |
Balance of unamortized debt issuance costs, line of credit | $ 2,259 |  |  |
Third Amended and Restated Credit Agreement [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  |  |  | $ 2,014
Minimum [Member] | Revolving Credit Agreement [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Basis Spread On Variable Rate | 0.85% |  |  |
Maximum [Member] | Revolving Credit Agreement [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Basis Spread On Variable Rate | 1.65% |  |  |
The Notes [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Percentage of Net Income | 50.00% |  |  |
Debt Covenant, Leverage Ratio, Maximum | 3.5 |  |  |
Debt Covenant, Leverage Ratio During Material Acquisition Period, Maximum | 4.0 |  |  |
Note Purchase Agreements 2008 and 2009 [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value | $ 485,940 |  |  |
Note Purchase Agreement 2013 and 2016 [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Debt Covenant, Minimum Consolidated Net Worth Calculation, Base Value | $ 1,046,619 |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |
Debt And Line Of Credit Facility [Line Items] |  |  |  |
Debt financing costs |  | $ 863 |  |

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