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Summary of Significant Accounting Policies (Detail 8) (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
Weighted average shares calculation:                      
Basic weighted average shares outstanding 29,664,259 30,937,394 32,231,011 32,143,064 31,772,379 31,651,061 31,561,412 31,482,853 31,243,932 31,616,926 30,854,796
Treasury stock effect of options and restricted stock (in shares)                 151,369 1,040,310 1,928,283
Diluted weighted average common shares outstanding 29,664,259 30,937,394 32,321,482 32,658,070 32,702,807 32,540,187 32,331,686 33,054,264 31,395,301 32,657,236 32,783,079
Net income $ (707) $ 18,373 $ 5,631 $ 7,093 $ 10,409 $ 11,288 $ 12,698 $ 6,709 $ 30,390 $ 41,104 $ 48,296
Basic earnings per common share (in dollars per share) $ (0.02) $ 0.59 $ 0.17 $ 0.22 $ 0.33 $ 0.36 $ 0.40 $ 0.21 $ 0.97 $ 1.30 $ 1.57
Diluted earnings per common share (in dollars per share) $ (0.02) $ 0.59 $ 0.17 $ 0.22 $ 0.32 $ 0.35 $ 0.39 $ 0.20 $ 0.97 $ 1.26 $ 1.47