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Computation of Net Loss per Common Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS (in shares) 1.2 1.6 1.2 1.6
Stock options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS (in shares) 0.3 0.4 0.3 0.4
Warrants        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS (in shares) 0.9 1.2 0.9 1.2