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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:      
Net earnings $ 442,111 $ 372,971 $ 232,368
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 113,278 116,170 119,743
Net (gain) loss on sales of assets and businesses (18,731) (457) 1,491
Stock-based compensation 31,674 33,052 23,383
Deferred income taxes (52,358) (44,606) (40,155)
Changes in operating assets and liabilities, net of the effect of acquisition:      
Trade accounts receivable (11,475) 35,799 (113,119)
Unbilled receivables (contract assets) (38,478) (51,168) (23,879)
Costs to fulfill a contract (14,812) (3,718) (11,544)
Inventories (49,624) (84,944) 3,234
Accounts payable and accrued liabilities 56,818 63,655 67,447
Contract liabilities (3,042) 31,538 20,115
Income taxes 31,992 (18,069) (3,652)
Retirement benefit obligations (3,406) (1,837) (909)
Other (12,653) (9,297) 34,020
Net cash provided by operating activities 471,294 439,089 308,543
Cash flows from investing activities:      
Payments for purchase of property, plant, and equipment (130,928) (96,280) (76,500)
Proceeds from sale of assets 42 2,292 488
Proceeds from business divestiture 50,068 1,800  
Payments for business acquisition, net of cash acquired (41,678)   878
Proceeds from sales of short-term investments 2,943 9,738 7,692
Payments for purchases of short-term investments   (6,767) (6,109)
Net cash used in investing activities (119,553) (89,217) (73,551)
Cash flows from financing activities:      
Cash dividends paid (64,975) (58,286) (51,027)
Proceeds from sales of treasury stock 104,578 89,875 50,749
Payments for repurchases of common stock (172,857) (390,819) (126,380)
Borrowings on revolving lines of credit and short-term borrowings 2,285,900 2,962,800 2,323,500
Payments on revolving lines of credit and short-term borrowings (2,380,600) (2,745,800) (2,390,300)
Payments of debt financing costs     (2,236)
Payments of long-term debt and finance lease obligations (85,972) (75,817) (779)
Net cash used in financing activities (313,926) (218,047) (196,473)
Effect of exchange rate changes on cash and cash equivalents 7,346 12,998 (8,916)
Net change in cash and cash equivalents 45,161 144,823 29,603
Cash and cash equivalents at beginning of year 282,270 137,447 107,844
Cash and cash equivalents at end of year $ 327,431 $ 282,270 $ 137,447