Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net earnings	$ 30,305	$ 41,570
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	30,721	33,077
Net gain on sales of assets and businesses	(1,538)	(588)
Stock-based compensation	11,892	13,469
Deferred income taxes		1,332
Changes in operating assets and liabilities:
Trade accounts receivable	55,907	57,001
Unbilled receivables (contract assets)	(37,067)	(17,468)
Costs to fulfill a contract	(4,782)	(5,321)
Inventories	(32,890)	(2,528)
Accounts payable and accrued liabilities	(32,142)	22,725
Contract liabilities	4,029	8,509
Income taxes	8,813	1,795
Retirement benefit obligations	(1,163)	(1,317)
Other	7,205	(5,531)
Net cash provided by operating activities	39,290	146,725
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(13,123)	(7,263)
Proceeds from sale of assets	1	48
Payments for purchases of short-term investments		(2,740)
Proceeds from sales of short-term investments	7
Net cash used in investing activities	(13,115)	(9,955)
Cash flows from financing activities:
Cash dividends paid	(10,247)	(5,102)
Proceeds from sales of treasury stock	3,198	10,855
Purchase of treasury stock	(39,258)
Borrowings on revolving lines of credit and short-term borrowings		74,400
Payments on revolving lines of credit and short-term borrowings		(74,400)
Payments of long-term debt and finance lease obligations	(381)	(100,395)
Net cash used in financing activities	(46,688)	(94,642)
Effect of exchange rate changes on cash and cash equivalents	(967)	6,483
Net change in cash and cash equivalents	(21,480)	48,611
Cash and cash equivalents, including restricted cash, at beginning of year	448,462	153,270
Cash and cash equivalents, including restricted cash, at end of period	$ 426,982	$ 201,881