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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, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 227,355 $ 345,592 $ 199,566 $ 169,537 $ 189,252 $ 231,849 $ 172,143 $ 158,126 $ 942,050 $ 751,370 $ 624,692
Cost of sales 170,870 266,690 150,539 127,923 141,180 174,809 129,943 120,671 716,022 566,603 462,872
Gross profit 56,485 78,902 49,027 41,614 48,072 57,040 42,200 37,455 226,028 184,767 161,820
Selling, general, and administrative expenses 49,041 54,325 43,459 38,951 41,734 41,049 40,557 36,095 185,776 159,435 146,433
Income from operations 7,444 24,577 5,568 2,663 6,338 15,991 1,643 1,360 40,252 25,332 15,387
Interest expense 1,180 1,473 1,582 1,227 914 1,141 1,253 1,146 5,462 4,454 4,024
Income before income tax provision (benefit) 6,264 23,104 3,986 1,436 5,424 14,850 390 214 34,790 20,878 11,363
Income tax (benefit) provision 678 9,285 1,497 748 (27,414)       12,208 (27,414) 91
Net income $ 5,586 $ 13,819 $ 2,489 $ 688 $ 32,838 $ 14,850 $ 390 $ 214 $ 22,582 $ 48,292 $ 11,272
Net income per share:                      
Diluted $ 0.22 $ 0.56 $ 0.10 $ 0.03 $ 1.32 $ 0.59 $ 0.02 $ 0.01 $ 0.91 $ 1.92 $ 0.46
Weighted average number of shares:                      
Diluted 25,010,193 24,770,980 24,758,826 24,742,330 24,883,360 25,316,092 25,265,857 24,947,968 24,820,847 25,102,289 24,655,262