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Acquisition-related Intangible Assets, Net (Tables)
3 Months Ended
Apr. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]  
Schedule of Acquired Assets
Acquisition-related intangible assets, net consisted of the following (in thousands):
 
April 30, 2018
 
January 31, 2018
Acquired developed technology
$
69,700

 
$
69,700

Customer relationship assets
1,000

 
1,000

 
70,700

 
70,700

Less accumulated amortization
(41,554
)
 
(36,466
)
Acquisition-related intangible assets, net
$
29,146

 
$
34,234

Developed technology and customer relationships  
Acquired Finite-Lived Intangible Assets [Line Items]  
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
As of April 30, 2018, our future estimated amortization expense related to acquired developed technology and customer relationship assets is as follows (in thousands):
Fiscal Period:
 
2019
$
14,998

2020
11,481

2021
1,517

2022
1,150

Total
$
29,146