Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Cash flows from operating activities:
Net income	$ 94,641	$ 77,379
Adjustments to reconcile net income to operating cash flows:
Depreciation	10,374	10,419
Amortization of intangibles	8,357	8,380
Impairment of goodwill and intangible assets	11,525
Deferred income tax (benefit)	(7,386)	(2,195)
(Gain) loss on disposition of property, plant and equipment	1	(232)
Stock-based compensation	2,051	484
Excess tax benefits from stock-based awards	(567)	(101)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	(80,598)	(116,831)
Inventories	(58,381)	(16,405)
Notes receivable		7,062
Prepaid income taxes, expenses and other	2,803	(323)
Accounts payable	36,287	52,908
Accrued liabilities	29,079	13,252
Other liabilities	(3,488)	3,520
Net cash provided by operating activities	44,698	37,317
Cash flows from investing activities:
Purchases of property, plant and equipment	(14,711)	(6,286)
Proceeds from dispositions of property, plant and equipment	195	448
Proceeds from notes receivable	7,000	500
Proceeds from dispositions of investments	400	400
Acquisitions	(10,718)	(170)
Other	389	600
Net cash used in investing activities	(17,445)	(4,508)
Cash flows from financing activities:
Cash dividends	(108,139)
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	1,180	1,028
Net cash used in financing activities	(108,401)	(100,258)
Net decrease in cash and equivalents	(81,148)	(67,449)
Cash and cash equivalents, beginning of period	218,642	215,435
Cash and cash equivalents, end of period	137,494	147,986
Supplemental cash flow information:
Income taxes paid	49,641	38,435
Interest paid	265	371
Non-cash transactions:
Capital expenditures in accounts payable	141	129
Disposition of ambulance net assets	$ 12,331