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Summary of Options Granted under 2007 Plan (Detail) (2007 Employee, Director and Consultant Stock Plan equity compensation plan, USD $)
 6 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2014
2007 Employee, Director and Consultant Stock Plan equity compensation plan
    
Number of Shares    
Beginning Balance 719,670 959,670
Granted 0 0
Vested 0 0
Exercised 0 (240,000)
Ending Balance 719,670 719,670
Weighted Average Grant Date Fair Value    
Outstanding Weighted Average Grant Date Fair Value Beginning Balance $ 11.58 $ 9.00
Granted $ 0 $ 0
Vested $ 0 $ 0
Exercised $ 0 $ 9.59
Outstanding Weighted Average Grant Date Fair Value Ending Balance $ 11.58 $ 11.58