Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net sales	$ 396,255	$ 293,121	$ 655,963	$ 505,399
Cost of sales	273,795	195,272	444,894	334,572
Gross profit	122,460	97,849	211,069	170,827
Selling, general and administrative expenses	70,822	60,155	133,991	113,602
Other general expenses		1,149		1,149
Operating income (loss)	51,638	36,545	77,078	56,076
Other expenses:
Interest expense	4,010	6,348	8,158	12,374
Total other expenses	4,010	6,348	8,158	12,374
Income (loss) before income taxes	47,628	30,197	68,920	43,702
Income tax expense (benefit)	11,810	7,557	16,395	10,914
Net income (loss)	$ 35,818	$ 22,640	$ 52,525	$ 32,788
Net income (loss) per common share - basic	$ 0.23	$ 0.15	$ 0.34	$ 0.21
Net income (loss) per common share - diluted	$ 0.23	$ 0.14	$ 0.34	$ 0.21
Comprehensive income (loss)	$ 35,818	$ 22,640	$ 52,525	$ 32,788
Weighted-average common shares outstanding - basic and diluted
Basic	154,661,277	153,509,612	154,551,589	153,366,516
Diluted	156,121,476	156,747,514	156,560,502	156,377,902