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Computation of Net Income (Loss) per Common Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS (in shares) 0.5 1.2 1.1 1.2
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 0.3 0.3 0.3
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 0.6 0.9
Stock awards        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from calculation of diluted EPS (in shares) 0.2   0.2