Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities:
Net income	$ 50,884	$ 36,038
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	6,892	6,970
Amortization of intangibles	5,562	5,624
Deferred income tax provision (benefit)	(206)	1,221
(Gain) loss on disposition of property, plant and equipment	(12)	52
Stock-based compensation	1,312	323
Excess tax benefits from stock-based awards	(567)	(101)
Changes in assets and liabilities (excluding acquisitions):
Accounts receivable	(18,230)	(5,197)
Inventories	(47,314)	(7,727)
Notes receivable		1,062
Prepaid income taxes, expenses and other	(9,047)	(5,080)
Accounts payable	22,233	12,115
Accrued liabilities	(8,555)	(10,912)
Other liabilities	(1,619)	1,627
Net cash provided by operating activities	1,333	36,015
Cash flows from investing activities:
Purchases of property, plant and equipment	(9,908)	(3,489)
Proceeds from dispositions of property, plant and equipment	188	11
Proceeds from notes receivable	7,000	500
Proceeds from dispositions of investments	400	400
Acquisitions	(10,718)	(170)
Other	148	600
Net cash used in investing activities	(12,890)	(2,148)
Cash flows from financing activities:
Cash dividends	(98,594)
Purchase of treasury stock		(77,000)
Shares repurchased related to cashless exercises of stock options	(2,009)
Excess tax benefits from stock-based awards	567	101
Proceeds from issuance of common stock	1,091	257
Net cash used in financing activities	(98,945)	(93,096)
Net decrease in cash and equivalents	(110,502)	(59,229)
Cash and cash equivalents, beginning of period	218,642	215,435
Cash and cash equivalents, end of period	108,140	156,206
Supplemental cash flow information:
Income taxes paid	42,686	32,638
Interest paid	167	270
Non-cash transactions:
Capital expenditures in accounts payable	$ 564	$ 177