Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Cash flows from operating activities:
Net income	$ 199,385	$ 179,002	$ 152,862
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	15,366	12,850	13,950
Amortization of intangibles	16,015	12,984	11,037
Impairment charges		710	13,525
Deferred income tax benefit	(7,292)	(2,177)	(9,904)
Gain on disposal of bus business		(7,079)
Gain on disposition of property, plant & equipment	(91)	(1,897)	(47)
Stock-based compensation	6,776	5,231	2,816
Excess tax benefits from stock-based awards	(135)	(960)	(740)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	41,324	(9,448)	(46,615)
Inventories	14,750	(44,774)	(37,037)
Prepaid expenses and other assets	(3,000)	(2,183)	(1,127)
Accounts payable	(26,632)	13,647	15,449
Accrued liabilities	(30)	7,706	32,318
Long-term liabilities and other	(8,576)	(14,351)	(1,421)
Net cash provided by operating activities	247,860	149,261	145,066
Cash flows from investing activities:
Purchases of property, plant & equipment	(42,283)	(30,406)	(24,305)
Proceeds from dispositions of property, plant & equipment	381	8,699	361
Proceeds from dispositions of investments		700	800
Proceeds from notes receivable	1,400	6,425	7,000
Proceeds from sale of bus business		105,043
Acquisitions, net of cash acquired	(194,486)	(86,092)	(10,718)
Proceeds from disposition of ambulance net assets			12,051
Other	20	(1,441)	815
Net cash provided by (used in) investing activities	(234,968)	2,928	(13,996)
Cash flows from financing activities:
Cash dividends	(57,381)	(49,024)	(38,162)
Special cash dividends		(53,290)	(79,525)
Purchase of treasury stock	(60,000)
Shares repurchased related to cashless exercise of stock options			(2,009)
Payments related to vesting of stock-based awards	(1,562)	(1,306)
Excess tax benefits from stock-based awards	135	960	740
Proceeds from issuance of common stock	141	3,206	5,845
Principal payments on capital lease obligations	(83)
Net cash used in financing activities	(118,750)	(99,454)	(113,111)
Net increase (decrease) in cash and cash equivalents	(105,858)	52,735	17,959
Cash and cash equivalents, beginning of year	289,336	236,601	218,642
Cash and cash equivalents, end of year	183,478	289,336	236,601
Supplemental cash flow information:
Income taxes paid	115,124	97,561	75,561
Interest paid	180	134	411
Non-cash transactions:
Capital expenditures in accounts payable	$ 1,540	$ 768	$ 736