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Summary of Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Stock-Based Compensation And Incentive Plans [Abstract]      
Weighted-average Exercise Price Beginning Balance Outstanding $ 41.69 $ 47.51 $ 46.24
Weighted-average Exercise Price, Granted 7.21 22.80  
Weighted-average Exercise Price, Exercised   35.21 36.86
Weighted-average Exercise Price, Expired or cancelled/forfeited 52.67 42.97  
Weighted-average Exercise Price, Ending Balance Outstanding $ 31.73 $ 41.69 $ 47.51
Number of Shares Outstanding      
Number of Shares Beginning Balance Outstanding 1,709,206 1,370,056 1,556,275
Number of Shares, Granted 405,817 428,326  
Number of Shares, Exercised   (29,118) (186,219)
Number of Shares, Expired or cancelled/forfeited (337,899) (60,058)  
Number of Shares Ending Balance Outstanding 1,777,124 1,709,206 1,370,056