Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net earnings	$ 304,488	$ 289,675
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	84,096	86,842
Net (gain) on sales of assets and businesses	(19,470)	(565)
Stock-based compensation	25,490	27,926
Deferred income taxes	(1,504)	44
Changes in operating assets and liabilities:
Trade accounts receivable	(15,296)	45,454
Unbilled receivables (contract assets)	(39,361)	(54,274)
Costs to fulfill a contract	(11,384)	(898)
Inventories	(63,130)	(95,275)
Accounts payable and accrued liabilities	12,379	19,508
Contract liabilities	(1,416)	21,337
Income taxes	(25,994)	(38,520)
Retirement benefit obligations	(2,654)	(1,486)
Other	(8,268)	(2,439)
Net cash provided by operating activities	237,976	297,329
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(78,537)	(72,193)
Proceeds from sale of assets	41	84
Proceeds from business divestiture	48,043	900
Payments for short-term investments		(6,767)
Proceeds from sales of short-term investments	2,935	9,737
Net cash (used in) investing activities	(27,518)	(68,239)
Cash flows from financing activities:
Cash dividends paid	(48,195)	(43,457)
Proceeds from sales of treasury stock	96,064	90,142
Payments for repurchases of common stock	(124,276)	(304,811)
Borrowings on revolving lines of credit and short-term borrowings	1,957,900	2,258,600
Payments on revolving lines of credit and short-term borrowings	(1,821,900)	(1,983,800)
Payments of long-term debt and finance lease obligations	(85,719)	(75,644)
Net cash (used in) financing activities	(26,126)	(58,970)
Effect of exchange rate changes on cash and cash equivalents	6,557	765
Net change in cash and cash equivalents	190,889	170,885
Cash and cash equivalents at beginning of year	282,270	137,447
Cash and cash equivalents at end of period	$ 473,159	$ 308,332