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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Statement of Comprehensive Income [Abstract]        
Net loss $ (217,564) $ (122,763) $ (446,864) $ (217,028)
Other comprehensive loss, net of tax:        
Change in unrealized gain (loss) on available-for-sale securities, net of tax (96) 1,019 469 853
Comprehensive loss $ (217,660) $ (121,744) $ (446,395) $ (216,175)