Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Effective income tax rate	21.00%	24.50%
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions	$ 5,000
Accrued interest	$ 1,320