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Income Taxes - Schedule of Changes in Unrecognized Tax Benefit (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Income Tax Disclosure [Abstract]      
Beginning balance $ 13,004 $ 12,671 $ 13,269
Tax positions related to prior years: Additions   353 75
Tax positions related to prior years: Reductions (263) (2,203) (1,510)
Tax positions related to current year: Additions 2,062 3,629 3,853
Settlements (773) (192) (1,450)
Lapses in statute of limitations (918) (1,254) (1,566)
Tax positions acquired from EHG 736    
Ending balance $ 13,848 $ 13,004 $ 12,671