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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, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 531,264 | $ 523,826 | $ 720,220 | $ 720,355 | $ 736,537 |  | $ 752,005 |  | $ 758,844 |  | $ 652,811 |  | $ 2,495,665 | $ 2,900,197 | $ 2,325,873
Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 336,308 | 306,494 | 474,236 | 473,925 | 505,904 |  | 498,775 |  | 482,954 |  | 392,887 |  | 1,590,963 | 1,880,520 |
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 194,956 | $ 217,332 | $ 245,984 | $ 246,430 | $ 230,633 | [1] | $ 253,230 | [1] | $ 275,890 | [1] | $ 259,924 | [1] | 904,702 | 1,019,677 |
Direct Sales to U.S. Government [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 155,283 | 122,825 | 86,799
Direct Sales to U.S. Government [Member] | Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 149,416 | 118,334 | 84,252
Direct Sales to U.S. Government [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,867 | $ 4,491 | $ 2,547
Direct Sales to U.S. Government [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of attributable to revenue |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 4.00% | 4.00%
Indirect Sales to U.S. Government [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 553,897 | $ 559,116 | $ 438,044
Indirect Sales to U.S. Government [Member] | Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 536,424 | 545,306 | 429,386
Indirect Sales to U.S. Government [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,473 | $ 13,810 | $ 8,658
Indirect Sales to U.S. Government [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of attributable to revenue |  |  |  |  |  |  |  |  |  |  |  |  | 22.00% | 19.00% | 19.00%
U.S. Government Related [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 709,180 | $ 681,941 | $ 524,843
U.S. Government Related [Member] | Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 685,840 | 663,640 | 513,638
U.S. Government Related [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,340 | $ 18,301 | $ 11,205
U.S. Government Related [Member] | Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity Wide Revenue Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of attributable to revenue |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% | 23.00% | 23.00%
[1] | Industrial segment earnings for the first through third quarters of fiscal year 2019 include pre-tax non-cash charges of $9,511, $8,985, $2,604, respectively. These costs are associated with the purchase accounting impacts related to the revaluation of the L’Orange inventory recognized in cost of goods sold and the amortization of the backlog intangible.

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