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Geographic Information - Long-Lived Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 611,293 $ 546,609
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 547,010 479,996
Ireland    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 51,205 52,904
Other countries    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 13,078 $ 13,709