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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 58,408	$ 72,325	$ 86,163	$ 74,640
Other comprehensive income:
Unrealized gain on pension plan obligation	[1]	455	457	910	911
Tax effect of unrealized gain on pension plan obligation		(133)	(125)	(258)	(249)
Unrealized gain on captive insurance collateral		107	905	43	1,294
Tax effect of unrealized gain on captive insurance collateral		(15)	(194)	(7)	(276)
Unrealized loss on interest rate hedges		(1,716)	(367)	(1,382)	(1,112)
Tax effect of unrealized loss on interest rate hedges		460	95	374	292
Total other comprehensive income (loss)		(842)	771	(320)	860
Total comprehensive income		$ 57,566	$ 73,096	$ 85,843	$ 75,500
[1] This item is included in the computation of net periodic pension cost.

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