Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Cash flows from operating activities:
Net income	$ 30,988	$ 22,358
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,444	3,514
Amortization of intangibles	2,768	2,847
Deferred income tax provision (benefit)	(2,185)	444
Loss on disposition of property, plant and equipment		2
Stock-based compensation	669	161
Excess tax benefits from stock-based awards	(60)
Changes in assets and liabilities (excluding acquisitions):
Accounts receivable	16,317	4,245
Inventories	(38,822)	1,373
Notes receivable		26
Prepaid expenses and other	(1,690)	(3,251)
Accounts payable	1,346	(2,437)
Accrued liabilities	(102)	(7,870)
Other liabilities	1,766	929
Net cash provided by operating activities	14,439	22,341
Cash flows from investing activities:
Purchases of property, plant and equipment	(5,893)	(2,041)
Acquisitions	(3,914)	(170)
Other		200
Net cash used in investing activities	(9,807)	(2,011)
Cash flows from financing activities:
Cash dividends	(9,527)	(8,227)
Purchases of treasury stock		(20,000)
Excess tax benefits from stock-based awards	60
Proceeds from issuance of common stock	691
Net cash used in financing activities	(8,776)	(28,227)
Net decrease in cash and equivalents	(4,144)	(7,897)
Cash and cash equivalents, beginning of period	218,642	215,435
Cash and cash equivalents, end of period	214,498	207,538
Supplemental cash flow information:
Income taxes paid	25,250	23,217
Interest paid	80	143
Non-cash transactions:
Capital expenditures in accounts payable	$ 325	$ 144