Income Taxes - Reconciliation of Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Income Tax Disclosure [Abstract]
Consolidated effective tax rate (as a percent)	32.80%	36.20%	37.10%
Current
Federal	$ 28,900	$ 29,392	$ 24,602
State	4,352	4,433	3,920
International	1,545	1,863	1,165
Total	34,797	35,688	29,687
Deferred
Federal	2,020	(216)	(425)
State	261	(153)	(218)
International	(2,223)	(1,341)	(806)
Total	$ 58	$ (1,710)	$ (1,449)