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Unearned Revenue and Performance Obligations - Narrative (Details) - USD ($)
$ in Billions
12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Revenue from Contract with Customer [Abstract]      
Subscription revenue recognized that was included in total unearned revenue balance at beginning of period $ 2.5 $ 2.2 $ 1.8