Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net earnings	$ 65,117	$ 78,211
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	59,257	61,331
Net loss (gain) on sales of assets and businesses	890	(1,541)
Stock-based compensation	15,538	13,957
Deferred income taxes	545	(55)
Changes in operating assets and liabilities:
Trade accounts receivable	(26,467)	(1,562)
Unbilled receivables (contract assets)	(18,015)	(48,742)
Costs to fulfill a contract	(4,193)	(10,884)
Inventories	(42,408)	(67,263)
Accounts payable and accrued liabilities	5,426	15,454
Contract liabilities	9,769	9,779
Income taxes	(34,886)	(725)
Retirement benefit obligations	(615)	(2,495)
Other	10,192	4,643
Net cash provided by operating activities	40,150	50,108
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(44,046)	(24,150)
Proceeds from sale of assets	199	5
Business acquisition, net of cash acquired	878
Payments for short-term investments		(8)
Proceeds from sales of short-term investments	7,733	11,305
Net cash (used in) investing activities	(35,236)	(12,848)
Cash flows from financing activities:
Cash dividends paid	(24,537)	(22,134)
Proceeds from sales of treasury stock	14,067	19,399
Payments for repurchases of common stock	(26,369)	(273,535)
Borrowings on revolving lines of credit and short-term borrowings	1,031,800	11,500
Payments on revolving lines of credit and short-term borrowings	(968,100)	(11,500)
Payments of debt financing costs	(2,236)
Payments of long-term debt and finance lease obligations	(288)	(564)
Net cash provided by (used in) financing activities	24,337	(276,834)
Effect of exchange rate changes on cash and cash equivalents	(7,668)	(533)
Net change in cash and cash equivalents	21,583	(240,107)
Cash and cash equivalents, including restricted cash, at beginning of year	107,844	448,462
Cash and cash equivalents, including restricted cash, at end of period	$ 129,427	$ 208,355