Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net earnings	$ 29,606	$ 30,305
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	29,304	30,721
Net loss (gain) on sales of assets and businesses	33	(1,538)
Stock-based compensation	11,316	11,892
Changes in operating assets and liabilities:
Trade accounts receivable	31,318	55,907
Unbilled receivables (contract assets)	(12,226)	(37,067)
Costs to fulfill a contract	(496)	(4,782)
Inventories	(50,559)	(32,890)
Accounts payable and accrued liabilities	(30,412)	(32,142)
Contract liabilities	2,065	4,029
Income taxes	890	8,813
Retirement benefit obligations	(664)	(1,163)
Other	(4,773)	7,205
Net cash provided by operating activities	5,402	39,290
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(24,390)	(13,123)
Proceeds from sale of assets	30	1
Business acquisition, net of cash acquired	878
Proceeds from sales of short-term investments	7	7
Net cash (used in) investing activities	(23,475)	(13,115)
Cash flows from financing activities:
Cash dividends paid	(11,355)	(10,247)
Proceeds from sales of treasury stock	1,199	3,198
Payments for repurchases of common stock	(26,369)	(39,258)
Borrowings on revolving lines of credit and short-term borrowings	413,700
Payments on revolving lines of credit and short-term borrowings	(371,200)
Payments of long-term debt and finance lease obligations	(98)	(381)
Net cash provided by (used in) financing activities	5,877	(46,688)
Effect of exchange rate changes on cash and cash equivalents	3,687	(967)
Net change in cash and cash equivalents	(8,509)	(21,480)
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	$ 99,335	$ 426,982