v3.20.1
Summary of Significant Accounting Policies - Revenue Recognition - ASC 606 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Feb. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Deferred contract acquisition costs, current $ 42,971 $ 28,847   $ 22,816
Deferred contract acquisition costs, noncurrent 71,235 9,918   40,255
Accrued expenses 30,355 32,541   33,096
Deferred revenue, current 412,985 218,700   219,033
Accumulated deficit (637,487) (519,126)   $ (495,708)
Revenue 481,413 249,824 $ 118,752  
Sales and marketing 266,595 172,682 104,277  
Net loss attributable to common stockholders $ (141,779) $ (140,077) $ (135,490)  
Net loss per share attributable to Crowdstrike Class A and Class B common stockholders, basic and diluted (in usd per share) $ (0.96) $ (3.12) $ (3.38)  
Without Adoption (ASC 605)        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Deferred contract acquisition costs, current $ 48,280 $ 28,847    
Deferred contract acquisition costs, noncurrent 20,277 9,918    
Accrued expenses 30,137 32,541    
Deferred revenue, current 412,871 218,700    
Accumulated deficit (682,804) (519,126)    
Revenue 481,195      
Sales and marketing 288,276      
Net loss attributable to common stockholders $ (163,678)      
Net loss per share attributable to Crowdstrike Class A and Class B common stockholders, basic and diluted (in usd per share) $ (1.11)      
Impact of Adoption | ASC 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Deferred contract acquisition costs, current $ 5,309 (6,031)    
Deferred contract acquisition costs, noncurrent (50,958) 30,337    
Accrued expenses (218) 555    
Deferred revenue, current (114) 333    
Accumulated deficit (45,317) $ 23,418    
Revenue (218)      
Sales and marketing 21,681      
Net loss attributable to common stockholders $ (21,899)