CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Cash flows from operating activities
Net income	$ 43,662,000	$ 34,680,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,754,000	7,573,000
Amortization	9,737,000	9,648,000
Stock-based compensation expense	5,837,000	4,354,000
Amortization of debt issuance costs	301,000	301,000
Loss on disposal of fixed assets	177,000	209,000
Loss on sale of business		2,206,000
Impairment of assets		1,287,000
Fair value adjustments to acquisition related liabilities	(551,000)	(2,516,000)
Deferred income taxes	(97,000)	(124,000)
Excess tax benefits from stock-based compensation	(1,586,000)	(2,662,000)
Changes in assets and liabilities, net of effects of business acquisitions/divestiture:
Accounts receivable	(10,315,000)	(7,239,000)
Inventories	(13,681,000)	(7,307,000)
Prepaid expenses and other current assets	(5,037,000)	(2,444,000)
Accounts payable and other current liabilities	14,518,000	(5,463,000)
Income taxes	84,000	871,000
Net cash provided by operating activities	51,803,000	33,374,000
Cash flows from investing activities
Capital expenditures	(12,258,000)	(8,329,000)
Proceeds from disposal of fixed assets	55,000	49,000
Proceeds from sale of business, net of cash retained and disposal costs		3,942,000
Acquisitions of businesses, net of cash acquired	(94,624,000)	(43,631,000)
Other, net	(89,000)	336,000
Net cash used in investing activities	(106,916,000)	(47,633,000)
Cash flows from financing activities
Borrowings under revolving credit facility	96,500,000	47,000,000
Repayments under revolving credit facility	(43,000,000)	(36,000,000)
Proceeds from exercises of stock options		393,000
Dividends paid	(2,502,000)	(2,076,000)
Excess tax benefits from stock-based compensation	1,586,000	2,662,000
Purchases of treasury stock	(3,551,000)	(3,536,000)
Net cash provided by financing activities	49,033,000	8,443,000
Effect of exchange rate changes on cash and cash equivalents	(142,000)	(600,000)
Decrease in cash and cash equivalents	(6,222,000)	(6,416,000)
Cash and cash equivalents at beginning of period	31,720,000	31,781,000
Cash and cash equivalents at end of period	$ 25,498,000	$ 25,365,000