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Business Combination - Pro Forma (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Business Combinations [Abstract]        
Total revenues $ 743,189 $ 578,551 $ 2,097,429 $ 1,620,094
Net loss $ (92,417) $ (121,309) $ (320,908) $ (409,032)
Net loss per share, basic and diluted (usd per share) $ (0.42) $ (0.58) $ (1.49) $ (1.98)