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Related-Party Transactions (Details) - Affiliated Entity
$ in Millions
9 Months Ended
Oct. 31, 2017
USD ($)
board_member
board_seat
employee
Related Party Transaction [Line Items]  
Number of Company's Board Members that Hold Board Seats in Foundation 1
Number of Board Seats in Foundation 3
Number of Company's Employees that Hold Board Seats in Non-Profit | employee 1
Number Company's Board Members that Hold Board Seats in Non-Profit | board_member 1
Number of Board Seats in Non-Profit Held by Company's Employees and Board Members 3
Number of Board Seats in Non-Profit 9
Value of resources donated to related parties | $ $ 7.4
Value of donated subscriptions to related parties | $ $ 129.7