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Income Taxes (Components of Loss before Provision for (Benefit from) Income Taxes) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ (263,505) $ (85,167) $ (190,043)
Foreign (160,247) (229,619) (195,470)
Loss before provision for (benefit from) income taxes $ (423,752) $ (314,786) $ (385,513)