CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Cash flows from operating activities
Net income	$ 36,870,000	$ 29,643,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,148,000	5,693,000
Amortization	7,966,000	6,391,000
Stock-based compensation expense	5,038,000	3,595,000
Amortization of debt issuance costs	201,000	201,000
Loss on disposal of fixed assets	402,000	111,000
Fair value adjustments to acquisition related liabilities	18,000	(571,000)
Deferred income taxes	821,000	688,000
Excess tax benefits from stock-based compensation		(1,541,000)
Changes in assets and liabilities, net of effects of business acquisitions:
Accounts receivable	(2,651,000)	(3,021,000)
Inventories	(1,008,000)	(4,251,000)
Prepaid expenses and other current assets	(3,628,000)	(5,034,000)
Accounts payable and other current liabilities	(2,543,000)	(1,681,000)
Income taxes	(3,633,000)	(1,952,000)
Net cash provided by operating activities	45,001,000	28,271,000
Cash flows from investing activities
Capital expenditures	(14,416,000)	(7,635,000)
Proceeds from disposal of fixed assets	26,000	35,000
Acquisition of businesses, net of cash acquired	(58,348,000)	(81,104,000)
Other, net	61,000	212,000
Net cash used in investing activities	(72,677,000)	(88,492,000)
Cash flows from financing activities
Borrowings under revolving credit facility	61,000,000	83,000,000
Repayments under revolving credit facility	(28,000,000)	(28,000,000)
Dividends paid	(2,921,000)	(2,502,000)
Excess tax benefits from stock-based compensation		1,541,000
Purchases of treasury stock	(6,264,000)	(3,432,000)
Net cash provided by financing activities	23,815,000	50,607,000
Effect of exchange rate changes on cash and cash equivalents	(155,000)	(502,000)
Decrease in cash and cash equivalents	(4,016,000)	(10,116,000)
Cash and cash equivalents at beginning of period	28,367,000	31,720,000
Cash and cash equivalents at end of period	$ 24,351,000	$ 21,604,000