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Geographic Information - Long-Lived Assets (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Jan. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 919,523 $ 796,907
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 835,303 726,801
Ireland    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 68,252 55,306
Other countries    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 15,968 $ 14,800