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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		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	$ 303,586	$ 270,605	$ 545,523	$ 507,526
Cost of sales	229,384	201,312	407,843	378,984
Income from operations	10,226	10,634	19,212	19,637
Income before income tax provision	7,193	7,794	13,663	14,255
Income tax provision	1,890	1,610	3,450	3,859
Net income	5,303	$ 6,184	10,213	$ 10,396
Balances without adoption of ASC Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	304,900		546,030
Cost of sales	230,098		408,350
Income from operations	10,826		19,212
Income before income tax provision	7,793		13,663
Income tax provision	2,027		3,450
Net income	5,766		10,213
Impact of adoption Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue	(1,314)		(507)
Cost of sales	(714)		$ (507)
Income from operations	(600)
Income before income tax provision	(600)
Income tax provision	(137)
Net income	$ (463)

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