Stock-Based Compensation - Assumptions to Estimate Fair Value of Option Grants (Parenthetical) (Detail) (USD $)	6 Months Ended		12 Months Ended				6 Months Ended
	Sep. 30, 2013 2014 $3.03 Value Per Option	Sep. 30, 2013 2014 $3.01 Value Per Option	Mar. 31, 2013 2013 $3.05 Value Per Option	Mar. 31, 2013 2013 $3.02 Value Per Option	Mar. 31, 2013 2013 $3.02 Value Per Option	Mar. 31, 2013 2013 $2.82 Value Per Option	Sep. 30, 2013 Black Scholes Based Option Pricing Model 2014 $3.03 Value Per Option	Sep. 30, 2013 Black Scholes Based Option Pricing Model 2014 $3.01 Value Per Option	Sep. 30, 2013 Black Scholes Based Option Pricing Model 2013 $3.05 Value Per Option	Sep. 30, 2013 Black Scholes Based Option Pricing Model 2013 $3.02 Value Per Option	Sep. 30, 2013 Black Scholes Based Option Pricing Model 2013 $3.02 Value Per Option	Sep. 30, 2013 Black Scholes Based Option Pricing Model 2013 $2.82 Value Per Option	Sep. 30, 2013 Monte Carlo Simulation 2014 $1.90 Value Per Option	Sep. 30, 2013 Monte Carlo Simulation 2014 $1.71 Value Per Option	Sep. 30, 2013 Monte Carlo Simulation 2013 $1.86 Value Per Option	Sep. 30, 2013 Monte Carlo Simulation 2013 $1.75 Value Per Option	Sep. 30, 2013 Monte Carlo Simulation 2013 $1.75 Value Per Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average value per option granted	$ 3.03	$ 3.01	$ 3.05	$ 3.02	$ 3.02	$ 2.82	$ 3.03	$ 3.01	$ 3.05	$ 3.02	$ 3.02	$ 2.82	$ 1.90	$ 1.71	$ 1.86	$ 1.75	$ 1.75