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Segment Information (Tables) | 6 Months Ended
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Mar. 31, 2026
Segment Reporting [Abstract] |
Summary of Consolidated Net Sales and Segment Operating Profit by Segment | A summary of consolidated net sales and segment operating profit by segment follows:
| Three Months Ended March 31, 2026 |  |  | Six Months Ended March 31, 2026 |
| Aerospace |  |  | Industrial |  |  | Total |  |  | Aerospace |  |  | Industrial |  |  | Total |
Net sales | $ | 703,321 |  |  | $ | 387,247 |  |  | $ | 1,090,568 |  |  | $ | 1,338,218 |  |  | $ | 748,804 |  |  | $ | 2,087,022 |
Cost of goods sold |  | 506,058 |  |  |  | 268,272 |  |  |  | 774,330 |  |  |  | 959,858 |  |  |  | 518,433 |  |  |  | 1,478,291 |
Selling, general and administrative expenses |  | 27,912 |  |  |  | 39,488 |  |  |  | 67,400 |  |  |  | 56,531 |  |  |  | 70,277 |  |  |  | 126,808 |
Research and development costs |  | 29,416 |  |  |  | 14,906 |  |  |  | 44,322 |  |  |  | 51,434 |  |  |  | 29,178 |  |  |  | 80,612 |
Other segment items 1 |  | (18,140 | ) |  |  | (1,140 | ) |  |  | (19,280 | ) |  |  | (36,075 | ) |  |  | (1,799 | ) |  |  | (37,874 | )
Reportable segment operating profit | $ | 158,075 |  |  | $ | 65,721 |  |  | $ | 223,796 |  |  | $ | 306,470 |  |  | $ | 132,715 |  |  | $ | 439,185 |
| Three Months Ended March 31, 2025 |  |  | Six Months Ended March 31, 2025 |
| Aerospace |  |  | Industrial |  |  | Total |  |  | Aerospace |  |  | Industrial |  |  | Total |
Net sales | $ | 561,729 |  |  | $ | 321,900 |  |  | $ | 883,629 |  |  | $ | 1,055,611 |  |  | $ | 600,743 |  |  | $ | 1,656,354 |
Cost of goods sold |  | 407,063 |  |  |  | 235,704 |  |  |  | 642,767 |  |  |  | 782,815 |  |  |  | 442,623 |  |  |  | 1,225,438 |
Selling, general and administrative expenses |  | 22,490 |  |  |  | 26,813 |  |  |  | 49,303 |  |  |  | 40,965 |  |  |  | 47,917 |  |  |  | 88,882 |
Research and development costs |  | 21,223 |  |  |  | 14,372 |  |  |  | 35,595 |  |  |  | 38,851 |  |  |  | 25,638 |  |  |  | 64,489 |
Other segment items 1 |  | (13,663 | ) |  |  | (956 | ) |  |  | (14,619 | ) |  |  | (26,361 | ) |  |  | (1,599 | ) |  |  | (27,960 | )
Reportable segment operating profit | $ | 124,616 |  |  | $ | 45,967 |  |  | $ | 170,583 |  |  | $ | 219,341 |  |  | $ | 86,164 |  |  | $ | 305,505 |
(1) Other segment items mainly includes our equity interest in the earnings of the JV, other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense, and net gain/loss on sales of assets and businesses. A summary of consolidated earnings before income taxes was as follows:
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Reportable segment operating profit |  | $ | 223,796 |  |  | $ | 170,583 |  |  | $ | 439,185 |  |  | $ | 305,505 |
Nonsegment expenses |  |  | (45,049 | ) |  |  | (26,752 | ) |  |  | (81,644 | ) |  |  | (48,856 | )
Interest expense, net |  |  | (11,320 | ) |  |  | (10,868 | ) |  |  | (20,963 | ) |  |  | (21,832 | )
Consolidated earnings before income taxes |  | $ | 167,427 |  |  | $ | 132,963 |  |  | $ | 336,578 |  |  | $ | 234,817 |
Summary of Consolidated Total Assets, Capital Expenditures, Depreciation and Amortization by Segment | Segment assets consist of accounts receivable, inventories, property, plant, and equipment, net, goodwill, and other intangibles, net. A summary of consolidated total assets was as follows:
|  | March 31, 2026 |  |  | September 30, 2025 |
Segment assets: |  |  |  |  |  |
Aerospace |  | $ | 2,276,086 |  |  | $ | 2,110,805 |
Industrial |  |  | 1,506,784 |  |  |  | 1,501,503 |
Unallocated corporate property, plant, and equipment, net |  |  | 122,023 |  |  |  | 120,502 |
Other unallocated assets |  |  | 1,064,219 |  |  |  | 897,333 |
Consolidated total assets |  | $ | 4,969,112 |  |  | $ | 4,630,143 |
A summary of consolidated capital expenditures was as follows:
|  | Six Months Ended March 31, |
|  | 2026 |  |  | 2025 |
Segment capital expenditures: |  |  |  |  |  |
Aerospace |  | $ | 67,742 |  |  | $ | 19,047 |
Industrial |  |  | 19,515 |  |  |  | 11,871 |
Unallocated corporate amounts |  |  | 9,013 |  |  |  | 21,072 |
Consolidated capital expenditures |  | $ | 96,270 |  |  | $ | 51,990 |
A summary of consolidated depreciation and amortization was as follows:
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Segment depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |  |
Aerospace |  | $ | 13,232 |  |  | $ | 12,607 |  |  | $ | 26,297 |  |  | $ | 25,341 |
Industrial |  |  | 13,127 |  |  |  | 11,979 |  |  |  | 25,909 |  |  |  | 24,115 |
Unallocated corporate amounts |  |  | 3,547 |  |  |  | 2,980 |  |  |  | 6,738 |  |  |  | 5,986 |
Consolidated depreciation and amortization |  | $ | 29,906 |  |  | $ | 27,566 |  |  | $ | 58,944 |  |  | $ | 55,442 |

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