CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash flows from operating activities
Net income	$ 54,381,000	$ 43,662,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	10,922,000	8,754,000
Amortization	11,930,000	9,737,000
Stock-based compensation expense	6,983,000	5,837,000
Amortization of debt issuance costs	295,000	301,000
Loss on disposal of fixed assets	489,000	177,000
Fair value adjustments to acquisition related liabilities	(265,000)	(551,000)
Deferred income taxes	(97,000)	(97,000)
Excess tax benefits from stock-based compensation		(1,586,000)
Changes in assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(13,108,000)	(10,315,000)
Inventories	(2,334,000)	(13,681,000)
Prepaid expenses and other current assets	(2,924,000)	(5,037,000)
Accounts payable and other current liabilities	9,220,000	14,518,000
Income taxes	(2,108,000)	84,000
Net cash provided by operating activities	73,384,000	51,803,000
Cash flows from investing activities
Capital expenditures	(20,765,000)	(12,258,000)
Proceeds from disposal of fixed assets	43,000	55,000
Acquisition of businesses, net of cash acquired	(69,998,000)	(94,624,000)
Other, net	344,000	(89,000)
Net cash used in investing activities	(90,376,000)	(106,916,000)
Cash flows from financing activities
Borrowings under revolving credit facility	74,000,000	96,500,000
Repayments under revolving credit facility	(45,000,000)	(43,000,000)
Dividends paid	(2,921,000)	(2,502,000)
Excess tax benefits from stock-based compensation		1,586,000
Purchases of treasury stock	(6,387,000)	(3,551,000)
Net cash provided by financing activities	19,692,000	49,033,000
Effect of exchange rate changes on cash and cash equivalents	(194,000)	(142,000)
Decrease in cash and cash equivalents	2,506,000	(6,222,000)
Cash and cash equivalents at beginning of period	28,367,000	31,720,000
Cash and cash equivalents at end of period	$ 30,873,000	$ 25,498,000