Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net sales	$ 1,441,448	$ 1,370,316	$ 1,355,586
Cost of sales	899,655	940,048	956,921
Gross profit	541,793	430,268	398,665
Selling, general and administrative expenses	327,770	305,162	279,889
Other general expenses	0	1,065	0
Loss on disposal of plant, property and equipment	1,934	249	496
Operating income	212,089	123,792	118,280
Other expenses:
Interest expense, net	40,253	39,293	24,956
Gain on sale of business	(37,688)	0	0
Total other expenses	2,565	39,293	24,956
Income before income taxes	209,524	84,499	93,324
Income tax expense	56,145	22,138	26,166
Net income	153,379	62,361	67,158
Other comprehensive income (loss):
Unrealized gain (loss) due to change in fair value of derivatives, net of tax	(3,560)	1,878	0
Total other comprehensive income (loss)	(3,560)	1,878	0
Comprehensive income	$ 149,819	$ 64,239	$ 67,158
Net income per common share:
Basic (in dollars per share)	$ 1.05	$ 0.42	$ 0.44
Diluted (in dollars per share)	$ 1.04	$ 0.41	$ 0.43
Weighted average shares used in calculating net income per common share:
Basic (in shares)	145,618,173	150,162,256	153,510,110
Diluted (in shares)	147,485,126	150,849,896	154,517,843