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Computation of Net (Loss) Income Per Common Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS 7.4 9.7 7.4 9.7
Unexercised Options
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS 3.9   3.9  
Unvested Options
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS   3.2   3.2
Warrants
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS 3.5 3.2 3.5 3.2
Convertible Notes
       
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS   3.3   3.3