Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net earnings	$ 187,600	$ 65,117
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	58,050	59,257
Net (gain) loss on sales of assets and businesses	(872)	890
Stock-based compensation	19,903	15,538
Deferred income taxes	43	545
Changes in operating assets and liabilities:
Trade accounts receivable	(40,619)	(26,467)
Unbilled receivables (contract assets)	(39,289)	(18,015)
Costs to fulfill a contract	(7,572)	(4,193)
Inventories	(59,841)	(42,408)
Accounts payable and accrued liabilities	12,131	5,426
Contract liabilities	26,748	9,769
Income taxes	(14,210)	(34,886)
Retirement benefit obligations	(1,240)	(615)
Other	3,286	10,192
Net cash provided by operating activities	144,118	40,150
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(56,301)	(44,046)
Proceeds from sale of assets	51	199
Proceeds from business divestiture	600
Business acquisition, net of cash acquired		878
Payments for short-term investments	(3,723)
Proceeds from sales of short-term investments	9,732	7,733
Net cash (used in) investing activities	(49,641)	(35,236)
Cash flows from financing activities:
Cash dividends paid	(28,327)	(24,537)
Proceeds from sales of treasury stock	43,087	14,067
Payments for repurchases of common stock		(26,369)
Borrowings on revolving lines of credit and short-term borrowings	1,539,100	1,031,800
Payments on revolving lines of credit and short-term borrowings	(1,397,800)	(968,100)
Payments of debt financing costs		(2,236)
Payments of long-term debt and finance lease obligations	(75,472)	(288)
Net cash provided by financing activities	80,588	24,337
Effect of exchange rate changes on cash and cash equivalents	4,420	(7,668)
Net change in cash and cash equivalents	179,485	21,583
Cash and cash equivalents at beginning of year	137,447	107,844
Cash and cash equivalents at end of period	$ 316,932	$ 129,427