Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Cash flows from operating activities:
Net income	$ 112,422	$ 94,641
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	9,462	10,374
Amortization of intangibles	9,229	8,357
Impairment charges	710	11,525
Deferred income tax provision (benefit)	1,456	(7,386)
Gain on disposal of bus business	(7,079)
(Gain) loss on disposition of property, plant and equipment	(194)	1
Stock-based compensation expense	3,943	2,051
Excess tax benefits from stock-based awards	(796)	(567)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	(125,492)	(80,598)
Inventories	(79,362)	(58,381)
Prepaid income taxes, expenses and other	(1,890)	2,803
Accounts payable	29,401	36,287
Accrued liabilities	18,590	29,079
Other liabilities	(3,950)	(3,488)
Net cash provided by (used in) operating activities	(33,550)	44,698
Cash flows from investing activities:
Purchases of property, plant and equipment	(19,431)	(14,711)
Proceeds from dispositions of property, plant and equipment	917	195
Proceeds from dispositions of investments	700	400
Proceeds from notes receivable	6,425	7,000
Proceeds from sale of bus business	105,043
Acquisitions, net of cash acquired	(33,683)	(10,718)
Transfer of cash to restricted account	(53,405)
Other	(660)	389
Net cash provided by (used in) investing activities	5,906	(17,445)
Cash flows from financing activities:
Regular cash dividends paid	(36,767)	(28,614)
Special cash dividends paid	(53,290)	(79,525)
Shares repurchased related to cashless exercises of stock options		(2,009)
Excess tax benefits from stock-based awards	796	567
Proceeds from issuance of common stock	2,491	1,180
Payments related to vesting of stock-based awards	(1,251)
Net cash used in financing activities	(88,021)	(108,401)
Net decrease in cash and cash equivalents	(115,665)	(81,148)
Cash and cash equivalents, beginning of period	236,601	218,642
Cash and cash equivalents, end of period	120,936	137,494
Supplemental cash flow information:
Income taxes paid	63,204	49,641
Interest paid	134	265
Non-cash transactions:
Capital expenditures in accounts payable	1,249	141
Other accounts receivable from sale of ambulance net assets		$ 12,331