Deferred Costs	9 Months Ended
Oct. 31, 2019
Deferred Costs [Abstract]
Deferred Costs	Deferred Costs Deferred costs, which consist of deferred sales commissions, were $29.9 million and $30.9 million as of October 31, 2019 and January 31, 2019, respectively. For the three and nine months ended October 31, 2019, amortization expense for the deferred costs was $4.8 million and $14.5 million, respectively. For the three and nine months ended October 31, 2018, amortization expense for the deferred costs was $4.6 million and $13.7 million, respectively. There have been no impairment losses recorded in relation to the costs capitalized for any period presented.

Deferred costs, which consist of deferred sales commissions, were $29.9 million and $30.9 million as of October 31, 2019 and January 31, 2019, respectively. For the three and nine months ended October 31, 2019, amortization expense for the deferred costs was $4.8 million and $14.5 million, respectively. For the three and nine months ended October 31, 2018, amortization expense for the deferred costs was $4.6 million and $13.7 million, respectively. There have been no impairment losses recorded in relation to the costs capitalized for any period presented.