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Common Stock and Stockholders' Equity - PRSU's (Detail) - Vesting March 15 2019 - All Other Employees - Performance Based Restricted Stock Unit PRSU - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSUs granted (in shares)   0.5
Compensation related cost $ 15