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Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Quarterly Financial Data [Abstract]                      
Net sales $ 428,069 $ 373,755 $ 356,362 $ 309,016 $ 322,333 $ 278,034 $ 291,487 $ 270,707 $ 1,467,202 $ 1,162,561 $ 1,013,874
Gross profit 66,397 57,264 55,092 46,792 46,023 38,893 40,122 35,015 225,545 160,053 165,417
Net income $ 16,549 $ 16,574 $ 13,335 $ 7,699 $ 8,426 $ 7,040 $ 4,914 $ 899 $ 54,157 $ 21,279 $ 29,853
Net income per common share:                      
Basic (in dollars per share) $ 0.37 $ 0.38 $ 0.31 $ 0.18 $ 0.20 $ 0.17 $ 0.12 $ 0.02 $ 1.24 $ 0.50 $ 0.72
Diluted (in dollars per share) $ 0.34 $ 0.35 $ 0.30 $ 0.17 $ 0.19 $ 0.16 $ 0.11 $ 0.02 $ 1.16 $ 0.48 $ 0.67