Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Income Tax Disclosure [Abstract]
Effective tax rate	28.70%	24.00%	28.50%	24.90%
Effective income tax rate reconciliation, tax settlement		$ 3,000,000
Unrecognized tax benefits	$ 18,700,000		$ 18,700,000
Accrued interest and penalties on unrecognized tax benefits	$ 2,200,000		$ 2,200,000
Statute of limitations period, average, years			5 years
Maximum possible reduction in amount of unrecognized tax benefits			$ 2,200,000.0
Unrecognized tax benefits potential expiration period			12 months