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Retirement Benefits (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Value of Company Stock Contributed to Defined Contribution Benefit Plans | $ 13,999 | $ 12,574 |  |
Treasury Stock Issued During Period, Shares, Employee Benefit Plans | 317 | 259 |  |
Business Acquisition, Acquiree - Duarte Business [Member] | Pension Plans, Defined Benefit [Member] |  |  |  |
Future cash payouts to beneficiaries of terminated plan | $ 221 |  | $ 221 |
Total stockholders equity |  |  |  |
Value of Company Stock Contributed to Defined Contribution Benefit Plans |  |  | 13,999 | $ 12,574
Treasury Stock at Cost [Member] |  |  |  |
Value of Company Stock Contributed to Defined Contribution Benefit Plans |  |  | $ 8,680 | $ 8,084
Treasury Stock Issued During Period, Shares, Employee Benefit Plans |  |  | 317 | 259

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