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New Accounting Pronouncements - Schedule of Impact of Adoption of New Revenue Standard on Consolidated Statements of Operations Line Items (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 308,136	$ 383,494	$ 303,586	$ 241,937	$ 308,591	$ 361,254	$ 270,605	$ 236,921	$ 1,237,153	$ 1,177,371	$ 1,052,320
Cost of sales	220,694	285,784	229,384	178,459	229,587	270,567	201,312	177,672	914,321	879,138	787,005
Income from operations	12,578	28,742	10,226	8,986	16,948	26,598	10,634	9,003	60,532	63,183	45,289
Income before income tax provision	9,484	25,806	7,193	6,470	14,926	24,099	7,794	6,461	48,953	53,280	37,808
Income tax provision	2,799	6,719	1,890	1,560	3,386	6,723	1,610	2,249	12,968	13,968	14,261
Net income	$ 6,685	$ 19,087	$ 5,303	$ 4,910	$ 11,540	$ 17,376	$ 6,184	$ 4,212	35,985	$ 39,312	$ 23,547
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue									1,237,899
Cost of sales									914,939
Income from operations									60,660
Income before income tax provision									49,081
Income tax provision									13,002
Net income									36,079
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue									(746)
Cost of sales									(618)
Income from operations									(128)
Income before income tax provision									(128)
Income tax provision									(34)
Net income									$ (94)

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