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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, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 149,682 $ 175,756 $ 160,008 $ 99,051 $ 137,347 $ 151,330 $ 143,992 $ 91,787 $ 584,497 $ 524,456 $ 480,894
Cost of sales 109,564 128,949 122,358 72,773 104,306 111,040 109,614 66,213 433,644 391,173 361,400
Gross profit 40,118 46,807 37,650 26,278 33,041 40,290 34,378 25,574 150,853 133,283 119,494
Selling, general, and administrative expenses 33,915 33,047 36,100 29,443 33,690 34,659 30,994 28,570 132,505 127,913 127,896
(Loss) income from operations 6,203 13,760 1,550 (3,165) (649) 5,631 3,384 (2,996) 18,348 5,370 (8,402)
Interest expense 862 1,193 1,166 997 1,009 1,018 1,203 1,217 4,218 4,447 3,488
(Loss) income before income tax benefit (provision) 5,341 12,567 384 (4,162) (1,658) 4,613 2,181 (4,213) 14,130 923 (11,890)
Income tax benefit (provision) (136) 1,070 (40)    60    116    894 176 367
Net (loss) income $ 5,205 $ 13,637 $ 344 $ (4,162) $ (1,598) $ 4,613 $ 2,297 $ (4,213) $ 15,024 $ 1,099 $ (11,523)
Net (loss) income per share:                      
Diluted $ 0.21 $ 0.56 $ 0.01 $ (0.18) $ (0.07) $ 0.20 $ 0.10 $ (0.19) $ 0.63 $ 0.05 $ (0.52)
Weighted average number of shares:                      
Diluted 24,267,879 24,177,020 24,019,409 22,955,715 22,906,723 23,515,737 23,253,524 22,592,370 24,003,728 23,335,918 22,375,271