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Subsequent Events	6 Months Ended
Subsequent Events	Jul. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In December 2017, the Company entered into a lease agreement for 106,230 rentable square feet of office space (the “Premises”) to accommodate its growing employee base in New York City. The Company received delivery of the Premises on January 1, 2018 to commence construction to renovate the Premises and expects to vacate its current office space prior to the expiration of its existing lease in December 2018. As a result of the Company’s involvement during the construction period, whereby the Company has certain indemnification obligations related to the construction, the Company is considered, for accounting purposes only, the owner of the construction project under build-to-suit lease accounting. On September 4, 2018, construction of the Premises was completed, although the Company has not fully vacated its existing office space. For the reporting period ending October 31, 2018, the Company will determine whether or not the lease for the Premises meets the criteria for “sale-leaseback” treatment.