Deferred Costs	6 Months Ended
Jul. 31, 2018
Deferred Costs [Abstract]
Deferred Costs	Note 3. Deferred Costs Deferred costs, which consist of deferred sales commissions, were $28.1 million and $30.3 million as of July 31, 2018 and January 31, 2018, respectively. For the three and six months ended July 31, 2018, amortization expense for the deferred costs was $4.6 million and $9.1 million, respectively. For the three and six months ended July 31, 2017, amortization expense for the deferred costs was $4.1 million and $8.1 million, respectively. There has been no impairment loss recorded in relation to the costs capitalized for all periods presented.

Note 3. Deferred Costs

Deferred costs, which consist of deferred sales commissions, were $28.1 million and $30.3 million as of July 31, 2018 and January 31, 2018, respectively. For the three and six months ended July 31, 2018, amortization expense for the deferred costs was $4.6 million and $9.1 million, respectively. For the three and six months ended July 31, 2017, amortization expense for the deferred costs was $4.1 million and $8.1 million, respectively. There has been no impairment loss recorded in relation to the costs capitalized for all periods presented.