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Quarterly Financial Data - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 308,591	$ 361,254	$ 270,605	$ 236,921	$ 250,618	$ 329,809	$ 245,018	$ 226,875	$ 1,177,371	$ 1,052,320	$ 942,050
Cost of sales	229,587	270,567	201,312	177,672	184,292	245,017	183,959	173,737	879,138	787,005	716,022
Gross profit	79,004	90,687	69,293	59,249	66,326	84,792	61,059	53,138	298,233	265,315	226,028
Selling, general, and administrative expenses	62,056	64,089	58,659	50,246	58,593	59,557	54,781	47,095	235,050	220,026	185,776
Income from operations	16,948	26,598	10,634	9,003	7,733	25,235	6,278	6,043	63,183	45,289	40,252
Interest expense	2,022	2,499	2,840	2,542	1,970	1,897	2,045	1,569	9,903	7,481	5,462
Income before income tax provision	14,926	24,099	7,794	6,461	5,763	23,338	4,233	4,474	53,280	37,808	34,790
Income tax provision	3,386	6,723	1,610	2,249	1,852	9,094	1,484	1,831	13,968	14,261	12,208
Net income	$ 11,540	$ 17,376	$ 6,184	$ 4,212	$ 3,911	$ 14,244	$ 2,749	$ 2,643	$ 39,312	$ 23,547	$ 22,582
Net income per share:
Diluted	$ 0.50	$ 0.75	$ 0.27	$ 0.19	$ 0.17	$ 0.57	$ 0.11	$ 0.11	$ 1.71	$ 0.95	$ 0.91
Weighted average number of shares:
Diluted	23,286,206	23,182,546	22,940,594	22,712,648	23,591,854	25,095,398	25,116,359	24,923,125	23,030,662	24,678,800	24,820,847

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