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Net (Loss) Income per Common Share - Additional Information (Detail)
3 Months Ended
Apr. 30, 2019
$ / shares
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Anti-dilutive common shares | shares 380,000
Anti-dilutive common shares exercise price, minimum | $ / shares $ 35.85
Anti-dilutive common shares exercise price, maximum | $ / shares $ 46.42
Performance Stock Units (PSUs)  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Anti-dilutive common shares | shares 711,418