Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net earnings		$ 41,570	$ 53,373
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization		33,077	32,451
Impairment of assets sold			37,902
Net gain on sales of assets and businesses	[1]	(588)	(13,547)
Stock-based compensation		13,469	10,982
Deferred income taxes		1,332	(47)
Changes in operating assets and liabilities:
Trade accounts receivable		57,001	37,652
Unbilled receivables (contract assets)		(17,468)	(33,150)
Costs to fulfill a contract		(5,321)	(6,401)
Inventories		(2,528)	(17,065)
Accounts payable and accrued liabilities		22,725	(79,535)
Contract liabilities		8,509	(144)
Income taxes		1,795	1,001
Retirement benefit obligations		(1,317)	(1,490)
Other		(5,531)	5,463
Net cash provided by operating activities		146,725	27,445
Cash flows from investing activities:
Payments for purchase of property, plant, and equipment		(7,263)	(17,232)
Proceeds from sale of assets		48	18,809
Payments for purchases of short-term investments		(2,740)	(2)
Net cash (used in) provided by investing activities		(9,955)	1,575
Cash flows from financing activities:
Cash dividends paid		(5,102)	(10,064)
Proceeds from sales of treasury stock		10,855	7,558
Borrowings on revolving lines of credit and short-term borrowings		74,400	461,633
Payments on revolving lines of credit and short-term borrowings		(74,400)	(441,500)
Payments of long-term debt and finance lease obligations		(100,395)	(439)
Net cash (used in) provided by financing activities		(94,642)	17,188
Effect of exchange rate changes on cash and cash equivalents		6,483	2,727
Net change in cash and cash equivalents		48,611	48,935
Cash and cash equivalents, including restricted cash, at beginning of year		153,270	99,073
Cash and cash equivalents, including restricted cash, at end of period		$ 201,881	$ 148,008

[1] Included in net gain on sale of assets and businesses for the three-months ended December 31, 2019 was the pre-tax gain on sale of Duarte real property in the amount of $13,522.