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Geographic Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue $ 788,628 $ 743,189 $ 671,720 $ 618,643 $ 582,480 $ 555,389 $ 525,320 $ 479,861 $ 2,822,180 $ 2,143,050 $ 1,574,440
Long-Lived Assets 796,907       546,609       796,907 546,609  
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 2,173,346 1,694,347 1,283,475
Long-Lived Assets 726,801       479,996       726,801 479,996  
Ireland                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Long-Lived Assets 55,306       52,904       55,306 52,904  
Other countries                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 648,834 448,703 $ 290,965
Long-Lived Assets $ 14,800       $ 13,709       $ 14,800 $ 13,709