Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Cash flows from operating activities:
Net income	$ 256,519	$ 199,385	$ 179,002
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	24,613	15,366	12,850
Amortization of intangibles	27,962	16,015	12,984
Amortization of debt issuance costs	131
Impairment charges	9,113		710
Deferred income tax benefit	(14,116)	(7,292)	(2,177)
Gain on disposal of bus business			(7,079)
Gain on disposition of property, plant & equipment	(35)	(91)	(1,897)
Stock-based compensation	9,387	6,776	5,231
Excess tax benefits from stock-based awards	(320)	(135)	(960)
Changes in assets and liabilities (excluding acquisitions and disposition):
Accounts receivable	(15,773)	41,324	(9,448)
Inventories	(15,582)	14,750	(44,774)
Prepaid expenses and other assets	719	(3,000)	(2,183)
Accounts payable	28,625	(26,632)	13,647
Accrued liabilities	26,016	(30)	7,706
Long-term liabilities and other	3,950	(8,576)	(14,351)
Net cash provided by operating activities	341,209	247,860	149,261
Cash flows from investing activities:
Purchases of property, plant & equipment	(51,976)	(42,283)	(30,406)
Proceeds from dispositions of property, plant & equipment	347	381	8,699
Proceeds from dispositions of investments			700
Proceeds from notes receivable	8,367	1,400	6,425
Proceeds from sale of bus business			105,043
Acquisitions, net of cash acquired	(557,651)	(194,486)	(86,092)
Other	(560)	20	(1,441)
Net cash provided by (used in) investing activities	(601,473)	(234,968)	2,928
Cash flows from financing activities:
Borrowings on revolving credit facility	360,000
Payments of debt issuance costs	(7,850)
Cash dividends	(62,970)	(57,381)	(49,024)
Special cash dividends			(53,290)
Purchase of treasury stock		(60,000)
Payments related to vesting of stock-based awards	(2,484)	(1,562)	(1,306)
Excess tax benefits from stock-based awards	320	135	960
Proceeds from issuance of common stock		141	3,206
Principal payments on capital lease obligations	(328)	(83)
Net cash provided by (used in) financing activities	286,688	(118,750)	(99,454)
Net increase (decrease) in cash and cash equivalents	26,424	(105,858)	52,735
Cash and cash equivalents, beginning of year	183,478	289,336	236,601
Cash and cash equivalents, end of year	209,902	183,478	289,336
Supplemental cash flow information:
Income taxes paid	128,409	115,124	97,561
Interest paid	672	180	134
Non-cash transactions:
Capital expenditures in accounts payable	$ 3,538	$ 1,540	$ 768