Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Current assets:
Cash and cash equivalents	$ 346,948		$ 278,314
Trade receivables, net of allowances	67,619		57,660
Inventories	204,871		195,600
Prepaid expenses	9,736		13,595
Other current assets	27,519		16,123
Total current assets	656,693		561,292
Property, plant and equipment - net	459,369		501,023
Goodwill	967,816		994,271
Intangible assets - net	164,083		199,497
Other assets	92,767		87,793
Total assets	2,340,728		2,343,876
Current liabilities:
Accounts payable	64,131		56,015
Accrued rebates	59,203		60,974	$ 49,400
Current portion of long-term debt obligations	6,000		6,000
Accrued expenses and other liabilities	84,713		66,727
Total current liabilities	214,047		189,716
Deferred income taxes	46,919		59,509
Long-term debt—less current portion	576,804		580,265
Other non-current liabilities	109,946		104,073
Total liabilities	947,716		933,563
Commitments and contingencies (See Note 17)
Stockholders' equity:
Preferred stock, $0.001 par value; 1,000,000 shares authorized and no shares issued or outstanding at June 30, 2024 and September 30, 2023, respectively	0		0
Additional paid‑in capital	1,684,739		1,662,322
Retained earnings (accumulated deficit)	60,639		(64,377)
Accumulated other comprehensive income (loss)	927	$ 691	1,878	691	$ (3,262)	$ 0
Treasury stock, at cost, 12,377,929 and 8,268,423 shares at June 30, 2024 and September 30, 2023, respectively	(353,450)		(189,666)
Total stockholders' equity	1,393,012	$ 1,386,931	1,410,313	$ 1,421,897	$ 1,419,390	$ 1,430,707
Total liabilities and stockholders' equity	2,340,728		2,343,876
Common Class A
Stockholders' equity:
Common stock	157		156
Common Class B
Stockholders' equity:
Common stock	$ 0		$ 0