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Geographic Information - Long-Lived Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Jan. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 885,789 $ 796,907
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 809,652 726,801
Ireland    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 61,064 55,306
Other countries    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 15,073 $ 14,800