CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Cash flows from operating activities
Net income	$ 59,953,000	$ 47,953,000	$ 43,265,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,989,000	10,692,000	8,245,000
Amortization	13,095,000	13,265,000	10,641,000
Stock-based compensation expense	8,361,000	5,867,000	5,409,000
Amortization of debt issuance costs	401,000	401,000	440,000
Loss on disposal of fixed assets	553,000	360,000	501,000
Loss on sale of business		2,206,000
Impairment of assets		1,287,000
Fair value adjustments to acquisition related liabilities	(687,000)	(2,585,000)	219,000
Deferred income taxes	(1,710,000)	(1,449,000)	(1,218,000)
Excess tax benefits from stock-based compensation	(1,179,000)	(3,168,000)	(4,391,000)
Changes in assets and liabilities, net of effects of business acquisitions/divestiture:
Accounts receivable	(12,729,000)	(3,905,000)	(6,149,000)
Inventories	(15,558,000)	(10,075,000)	(2,658,000)
Prepaid expenses and other current assets	(2,850,000)	(2,996,000)	(2,388,000)
Accounts payable and other current liabilities	17,657,000	(3,347,000)	6,205,000
Income taxes	2,972,000	4,564,000	6,151,000
Net cash provided by operating activities	80,268,000	59,070,000	64,272,000
Cash flows from investing activities
Capital expenditures	(18,889,000)	(12,760,000)	(13,541,000)
Proceeds from disposal of fixed assets	96,000	25,000	14,000
Proceeds from sale of business, net of cash retained and disposal costs		3,767,000
Acquisition of businesses, net of cash acquired	(94,528,000)	(43,567,000)	(33,547,000)
Other, net	339,000	241,000	(358,000)
Net cash used in investing activities	(112,982,000)	(52,294,000)	(47,432,000)
Cash flows from financing activities
Borrowings under revolving credit facility	96,500,000	47,000,000	28,000,000
Repayments under term loan facility			(5,000,000)
Repayments under revolving credit facility	(59,000,000)	(49,000,000)	(37,500,000)
Debt modification costs			(1,314,000)
Proceeds from exercises of stock options		608,000	634,000
Dividends paid	(5,005,000)	(4,154,000)	(3,721,000)
Excess tax benefits from stock-based compensation	1,179,000	3,168,000	4,391,000
Purchases of treasury stock	(3,732,000)	(3,727,000)	(4,439,000)
Net cash provided by (used in) financing activities	29,942,000	(6,105,000)	(18,949,000)
Effect of exchange rate changes on cash and cash equivalents	(581,000)	(732,000)	(186,000)
Decrease in cash and cash equivalents	(3,353,000)	(61,000)	(2,295,000)
Cash and cash equivalents at beginning of period	31,720,000	31,781,000	34,076,000
Cash and cash equivalents at end of period	$ 28,367,000	$ 31,720,000	$ 31,781,000