Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net income	$ 153,379	$ 62,361	$ 67,158
Adjustments to reconcile net income to net cash flows provided by (used in) operating activities:
Depreciation expense	89,612	86,206	67,996
Amortization expense	39,430	46,338	50,537
Non-cash interest expense	1,647	1,647	5,638
Non-cash lease expense	(91)	(251)	(275)
Deferred income tax expense (benefit)	(21,458)	(8,579)	23,394
Non-cash compensation expense	25,923	18,518	27,512
Loss on disposition of property, plant and equipment	1,934	2,220	496
Bad debt provision	(830)	731	290
Gain on sale of business	(37,688)	0	0
Loss on extinguishment of debt	715	0	0
Changes in operating assets and liabilities:
Trade receivables	6,272	31,768	(8,545)
Inventories	(47,536)	86,073	(86,804)
Prepaid expenses and other current assets	(7,932)	(848)	(10,598)
Accounts payable	(3,444)	22,596	(32,146)
Accrued expenses and interest	23,884	11,890	(1,345)
Other assets and liabilities	662	1,872	2,527
Net cash provided by operating activities	224,479	362,542	105,835
Investing activities:
Purchases of property, plant and equipment	(77,147)	(88,545)	(170,938)
Proceeds from sale of property, plant and equipment	474	202	649
Purchases of intangible assets	0	0	(1,500)
Divestiture, net of cash disposed	131,783	0	0
Acquisitions, net of cash acquired	(5,971)	(161)	(108,387)
Net cash provided by (used in) investing activities	49,139	(88,504)	(280,176)
Financing activities:
Proceeds under Revolving Credit Facility	0	25,000	40,000
Payments under Revolving Credit Facility	0	(25,000)	(40,000)
Repayments of finance lease obligations	(2,946)	(2,619)	(3,865)
Payments of INTEX contingent consideration	0	(5,850)	0
Exercise of vested stock options	20,852	14,954	5,995
Cash paid for shares withheld for taxes	(5,214)	(1,528)	(429)
Purchases of treasury stock	(242,502)	(115,498)	(81,483)
Net cash provided by (used in) financing activities	(387,907)	(116,541)	44,622
Net increase (decrease) in cash and cash equivalents	(114,289)	157,497	(129,719)
Cash and cash equivalents at beginning of period	278,314	120,817	250,536
Cash and cash equivalents at end of period	164,025	278,314	120,817
Supplemental cash flow disclosure:
Cash paid for interest, net of amounts capitalized	49,232	46,010	14,899
Cash paid for income taxes, net	87,867	34,480	10,549
Supplemental non-cash investing and financing disclosure:
Capital expenditures in accounts payable at end of period	9,950	7,703	29,562
Right-of-use operating and finance lease assets obtained in exchange for lease liabilities	25,196	3,830	33,400
Term Loan Agreement
Financing activities:
Payments of Term Loan Agreement	0	0	(467,654)
2022 Term Loan Agreement
Financing activities:
Proceeds from term loans	0	0	595,500
Payments on term loans	(594,000)	(6,000)	0
Payments of debt issuance costs	0	0	(3,442)
2024 Term Loan
Financing activities:
Proceeds from term loans	438,900	0	0
2024 Revolving Credit Facility
Financing activities:
Payments of debt issuance costs	$ (2,997)	$ 0	$ 0