Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net earnings	$ 87,091	$ 90,044
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	27,876	28,825
Net gain on sales of assets and businesses	(9,243)	(9)
Stock-based compensation	6,666	4,937
Deferred income taxes	(1,504)	44
Changes in operating assets and liabilities:
Trade accounts receivable	83,511	6,430
Unbilled receivables (contract assets)	(16,667)	(27,154)
Costs to fulfill a contract	(3,076)	(1,580)
Inventories	(49,514)	(36,383)
Accounts payable and accrued liabilities	(94,647)	(31,654)
Contract liabilities	(4,352)	7,502
Income taxes	6,356	8,766
Retirement benefit obligations	(840)	(434)
Other	2,859	(2,545)
Net cash provided by operating activities	34,516	46,789
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(33,574)	(41,812)
Proceeds from sale of assets and short-term investments	36	36
Proceeds from business divestiture	1,438
Net cash (used in) investing activities	(32,100)	(41,776)
Cash flows from financing activities:
Cash dividends paid	(14,781)	(13,209)
Proceeds from sales of treasury stock	28,876	15,267
Payments for repurchases of common stock	(35,473)
Borrowings on revolving lines of credit and short-term borrowings	668,300	728,600
Payments on revolving lines of credit and short-term borrowings	(627,300)	(663,500)
Payments of long-term debt and finance lease obligations	(236)	(75,249)
Net cash provided by (used in) financing activities	19,386	(8,091)
Effect of exchange rate changes on cash and cash equivalents	(20,346)	9,979
Net change in cash and cash equivalents	1,456	6,901
Cash and cash equivalents at beginning of year	282,270	137,447
Cash and cash equivalents at end of period	$ 283,726	$ 144,348