Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net earnings	$ 117,657	$ 158,744
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	91,258	97,799
Net (gain) on sales of assets and businesses	(1,545)	(4,073)
Stock-based compensation	17,136	19,053
Deferred income taxes	(56)	137
Changes in operating assets and liabilities:
Trade accounts receivable	(6,745)	4,107
Unbilled receivables (contract assets)	(64,892)	(25,159)
Costs to fulfill a contract	(13,541)	(14,750)
Inventories	(93,818)	13,562
Accounts payable and accrued liabilities	36,117	51,308
Contract liabilities	8,420	20,113
Income taxes	5,277	3,492
Retirement benefit obligations	(3,442)	(5,221)
Other	(5,810)	(1,197)
Net cash provided by operating activities	86,016	317,915
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment	(37,105)	(21,347)
Proceeds from sale of assets	4	141
Proceeds from the sale of the renewable power systems business and other related businesses	6,000
Payments for purchases of short-term investments	(9,619)	(14,326)
Proceeds from sales of short-term investments	11,305	16,566
Net cash used in investing activities	(29,415)	(18,966)
Cash flows from financing activities:
Cash dividends paid	(33,572)	(25,734)
Proceeds from sales of treasury stock	20,283	32,219
Payments for repurchases of common stock	(440,233)
Borrowings on revolving lines of credit and short-term borrowings	477,400	74,400
Payments on revolving lines of credit and short-term borrowings	(428,200)	(74,400)
Payments of long-term debt and finance lease obligations	(644)	(101,214)
Net cash used in financing activities	(404,966)	(94,729)
Effect of exchange rate changes on cash and cash equivalents	(396)	4,517
Net change in cash and cash equivalents	(348,761)	208,737
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	$ 99,701	$ 362,007