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Stock Option Plan and Stock Based Compensation - Summary of Stock Options Exercised and Tax Benefits Realized from Stock Based Compensation (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Total cash received $ 44 $ 9 $ 89 $ 35
Income tax benefits            
Total grant-date fair value 8 1 16 6
Intrinsic value $ 44 $ 6 $ 90 $ 23