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Quarterly Financial Data - Summary of Quarterly Financial Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 164,084 $ 214,401 $ 136,615 $ 109,592 $ 149,682 $ 175,756 $ 160,008 $ 99,051 $ 624,692 $ 584,497 $ 524,456
Cost of sales 121,168 160,195 101,829 79,682 109,564 128,949 122,358 72,773 462,872 433,644 391,173
Gross profit 42,916 54,206 34,786 29,910 40,118 46,807 37,650 26,278 161,820 150,853 133,283
Selling, general, and administrative expenses 36,823 41,652 35,687 32,282 33,915 33,047 36,100 29,443 146,433 132,505 127,913
(Loss) income from operations 6,093 12,554 (901) (2,372) 6,203 13,760 1,550 (3,165) 15,387 18,348 5,370
Interest expense 885 1,051 1,078 997 862 1,193 1,166 997 4,024 4,218 4,447
(Loss) income before income tax benefit (provision) 5,208 11,503 (1,979) (3,369) 5,341 12,567 384 (4,162) 11,363 14,130 923
Income tax benefit (provision) (91) 0 0 0 (136) 1,070 (40) 0 (91) 894 176
Net (loss) income $ 5,117 $ 11,503 $ (1,979) $ (3,369) $ 5,205 $ 13,637 $ 344 $ (4,162) $ 11,272 $ 15,024 $ 1,099
Net (loss) income per share:                      
Diluted $ 0.21 $ 0.47 $ (0.08) $ (0.14) $ 0.21 $ 0.56 $ 0.01 $ (0.18) $ 0.46 $ 0.63 $ 0.05
Weighted average number of shares:                      
Diluted 24,813,777 24,719,369 23,845,302 23,715,945 24,267,879 24,177,020 24,019,409 22,955,715 24,655,262 24,003,728 23,335,918