Income Taxes (Details 4) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Current deferred tax assets:
Accrued expenses	$ 3,650,000	$ 2,753,000
Inventories	1,996,000	1,321,000
Accounts receivable	941,000	732,000
Subtotal	6,587,000	4,806,000
Valuation allowance	(354,000)	(1,255,000)
Total current deferred tax assets	6,233,000	3,551,000
Non-current deferred tax assets:
Other long-term liabilities	690,000	928,000
Stock-based compensation	2,640,000	2,633,000
Capital investment	546,000	175,000
Foreign tax credit		133,000
Domestic NOLs	498,000	2,660,000
Foreign NOLs	4,861,000	4,552,000
Subtotal	9,235,000	11,081,000
Valuation allowance	(1,683,000)	(2,283,000)
Net non-current deferred tax assets	7,552,000	8,798,000
Non-current deferred tax liabilities:
Property and equipment	(6,154,000)	(4,784,000)
Intangible assets	(14,711,000)	(12,554,000)
Goodwill	(10,409,000)	(9,265,000)
Gross non-current deferred tax liabilities	(31,274,000)	(26,603,000)
Net non-current deferred tax liabilities	$ (23,722,000)	$ (17,805,000)
Combined U.S. Federal and state effective rate applied to deferred taxes (as a percent)	37.40%	37.60%