Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	20.00%	22.50%	20.40%	23.80%
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions	$ 7,900		$ 7,900
Accrued interest	$ 2,000		$ 2,000