Income Taxes - Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Income Taxes - Income tax reconciliation
Consolidated effective income tax rate (as a percent)			31.90%	36.70%
Excess tax benefits			(2.70%)
Acquisition related items, net			(0.50%)
International operations			(0.30%)
Other			(1.30%)
Reduction of income tax expense		$ 797,000		$ 2,071,000
New Accounting Pronouncement, Early Adoption, Effect | ASU 2016-09 Share-Based Payment Accounting
Income Taxes - Income tax reconciliation
Reduction of income tax expense	$ (95,000)		$ 2,191,000