CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Cash flows from operating activities
Net income	$ 22,311,000	$ 20,028,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,967,000	3,574,000
Amortization	5,245,000	4,840,000
Stock-based compensation expense	2,556,000	1,887,000
Amortization of debt issuance costs	162,000	176,000
Loss on disposal of fixed assets	296,000	140,000
Deferred income taxes	575,000	139,000
Excess tax benefits from stock-based compensation	(3,297,000)	(1,868,000)
Changes in assets and liabilities, net of assets acquired and liabilities assumed:
Accounts receivable	(7,190,000)	(2,265,000)
Inventories	(1,812,000)	(4,000)
Prepaid expenses and other current assets	(1,225,000)	(1,846,000)
Accounts payable and other current liabilities	(1,807,000)	(8,766,000)
Income taxes	1,768,000	3,016,000
Net cash provided by operating activities	21,549,000	19,051,000
Cash flows from investing activities
Capital expenditures	(4,363,000)	(2,548,000)
Proceeds from disposal of fixed assets	3,000	4,000
Acquisition of Jet Prep, net of cash acquired	(5,332,000)
Acquisition of Sterilator, net of cash acquired	(2,829,000)
Acquisition of SPS Business, net of cash acquired		(35,415,000)
Acquisition of Polyp Trap		(486,000)
Acquisition of Eagle Pure Water		(870,000)
Other, net	(319,000)	(94,000)
Net cash used in investing activities	(12,840,000)	(39,409,000)
Cash flows from financing activities
Borrowings under revolving credit facility, net of debt issuance costs		37,000,000
Repayments under term loan facility	(5,000,000)	(5,000,000)
Repayments under revolving credit facility	(15,500,000)	(15,000,000)
Proceeds from exercises of stock options	207,000	1,409,000
Dividends paid	(1,858,000)	(1,494,000)
Excess tax benefits from stock-based compensation	3,297,000	1,868,000
Purchases of treasury stock	(4,057,000)	(1,872,000)
Net cash (used in) provided by financing activities	(22,911,000)	16,911,000
Effect of exchange rate changes on cash and cash equivalents	(168,000)	86,000
Decrease in cash and cash equivalents	(14,370,000)	(3,361,000)
Cash and cash equivalents at beginning of period	34,076,000	30,186,000
Cash and cash equivalents at end of period	$ 19,706,000	$ 26,825,000