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Deferred Costs
9 Months Ended
Oct. 31, 2018
Deferred Costs [Abstract]  
Deferred Costs

Note 3. Deferred Costs

Deferred costs, which consist of deferred sales commissions, were $28.0 million and $30.3 million as of October 31, 2018 and January 31, 2018, 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. For the three and nine months ended October 31, 2017, amortization expense for the deferred costs was $4.2 million and $12.3 million, respectively. There has been no impairment loss recorded in relation to the costs capitalized for any period presented.