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Stock Options and Awards (Detail) - Summary data of nonvested stock award activity - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2017
Sep. 30, 2016
Summary data of nonvested stock award activity [Abstract]        
Nonvested shares outstanding, number of nonvested shares     165,708 130,457
Nonvested shares outstanding, weighted average grant date fair value (in Dollars per share)     $ 6.38 $ 6.08
Nonvested shares outstanding, weighted average remaining contractual term 2 years 2 months 13 days 2 years 1 month 13 days 2 years 84 days  
Nonvested shares outstanding, aggregate intrinsic value (in Dollars)     $ 1,695 $ 714
Activity in 2016:        
Granted, number of nonvested shares     94,000 105,395
Granted, weighted average grant date fair value (in Dollars per share)     $ 10.18 $ 6.47
Vested, number of nonvested shares     (71,587) (48,444)
Vested, weighted average grant date fair value (in Dollars per share)     $ 6.59 $ 6.33
Forfeited, number of nonvested shares     (8,300) (21,700)
Forfeited, weighted average grant date fair valuem (in Dollars per share)     $ 7.11 $ 7.38
Activity in 2017:        
Vested at September 30, 2017     250,864  
Vested at September 30, 2013 (in Dollars per share)     $ 5.96  
Vested at September 30, 2017     113 days  
Vested at September 30, 2013 (in Dollars)     $ 2,772  
Vested and expected to vest at September 30, 2017     430,685  
Vested and expected to vest at September 30, 2013 (in Dollars per share)     $ 7.08  
Vested and expected to vest at September 30, 2017     1 year 40 days  
Vested and expected to vest at September 30, 2013 (in Dollars)     $ 4,759  
Nonvested shares outstanding, number of nonvested shares     179,821 165,708
Nonvested shares outstanding, weighted average grant date fair value (in Dollars per share)     $ 8.64 $ 6.38
Nonvested shares outstanding, aggregate intrinsic value (in Dollars)     $ 1,987 $ 1,695