Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net earnings	$ 113,245	$ 271,623	$ 258,047
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	106,779	107,658	108,829
Share-based compensation expense	8,426	9,180	10,519
Amortization of deferred financing costs	4,118	3,786	3,832
Net loss/(gain) on disposal and impairment of assets	3,562	(7,544)	181
Net loss on extinguishment of debt	38	951	876
Deferred income taxes	13,691	5,532	(20,538)
Changes in (exclusive of effects of acquisitions):
Trade accounts receivable	10,031	4,399	(1,949)
Accounts receivable, other	41,463	(20,432)	2,743
Inventory	149,845	(20,272)	(16,450)
Other current assets	(15,654)	7,418	12,164
Other assets	(2,007)	(3,225)	48
Accounts payable and accrued liabilities	(26,876)	(42,719)	4,592
Income taxes payable	(5,489)	6,144	(221)
Operating lease assets and liabilities	10,339
Other liabilities	15,378	(2,084)	9,988
Net cash provided by operating activities	426,889	320,415	372,661
Cash Flows from Investing Activities:
Payments for property and equipment	(110,858)	(107,755)	(86,507)
Proceeds from sales of property and equipment	53	15,312	369
Acquisitions, net of cash acquired	(12,970)	(3,424)	(9,175)
Net cash used by investing activities	(123,775)	(95,867)	(95,313)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,087,504	593,504	461,819
Repayments of long-term debt	(882,921)	(777,538)	(558,599)
Debt issuance costs	(6,257)		(1,151)
Payments for common stock repurchased	(61,357)	(47,434)	(166,701)
Proceeds from exercises of stock options	2,792	2,160	1,350
Net cash provided (used) by financing activities	139,761	(229,308)	(263,282)
Effect of foreign exchange rate changes on cash and cash equivalents	(219)	(1,040)	(530)
Net increase (decrease) in cash and cash equivalents	442,656	(5,800)	13,536
Cash and cash equivalents, beginning of period	71,495	77,295	63,759
Cash and cash equivalents, end of period	514,151	71,495	77,295
Supplemental Cash Flow Information:
Interest paid	83,123	95,171	90,077
Income taxes paid	49,869	83,783	70,253
Capital expenditures incurred but not paid	$ 9,772	$ 26,233	$ 15,315