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Segment Information (U.S. Government Related Sales by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 606,788 | $ 548,622 | $ 500,381 | $ 442,894 | $ 590,922 | $ 507,664 | $ 479,382 | $ 445,110 | $ 2,098,685 | $ 2,023,078 | $ 2,038,303
Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 399,141 | 355,992 | 320,526 | 266,680 | 365,305 | 308,582 | 290,690 | 268,599 | 1,342,339 | 1,233,176 | 1,160,883
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 207,647 | $ 192,630 | $ 179,855 | $ 176,214 | $ 225,617 | $ 199,082 | $ 188,692 | $ 176,511 | 756,346 | 789,902 | 877,420
U.S. Government Related [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 483,761 | $ 430,373 | $ 364,388
Percentage of total attributable to major customer |  |  |  |  |  |  |  |  | 23.00% | 21.00% | 18.00%
U.S. Government Related [Member] | Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 469,221 | $ 413,978 | $ 350,713
U.S. Government Related [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,540 | 16,395 | 13,675
Indirect Sales to U.S. Government [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 373,350 | $ 320,797 | $ 267,230
Percentage of total attributable to major customer |  |  |  |  |  |  |  |  | 18.00% | 16.00% | 13.00%
Indirect Sales to U.S. Government [Member] | Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 362,536 | $ 310,952 | $ 258,391
Indirect Sales to U.S. Government [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,814 | 9,845 | 8,839
Direct Sales to U.S. Government [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 110,411 | $ 109,576 | $ 97,158
Percentage of total attributable to major customer |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00%
Direct Sales to U.S. Government [Member] | Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 106,685 | $ 103,026 | $ 92,322
Direct Sales to U.S. Government [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 3,726 | $ 6,550 | $ 4,836
Sales [Member] | General Electric [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total attributable to major customer |  |  |  |  |  |  |  |  | 16.00% | 17.00% | 18.00%
Trade Accounts Receivable [Member] | U.S. Government Related [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total attributable to major customer |  |  |  |  |  |  |  |  | 3.00% | 2.00% |
Trade Accounts Receivable [Member] | General Electric [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total attributable to major customer |  |  |  |  |  |  |  |  | 10.00% | 14.00% |

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