Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net income	$ 430,151	$ 374,254	$ 256,519
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	38,105	34,333	24,613
Amortization of intangibles	55,118	63,925	27,962
Amortization of debt issuance costs	1,570	1,570	131
Impairment charges			9,113
Deferred income tax provision (benefit)	14,525	(39,552)	(14,116)
Gain on disposition of property, plant & equipment	(1,450)	(2,231)	(35)
Stock-based compensation	17,000	12,500	9,387
Excess tax benefits from stock-based awards			(320)
Changes in assets and liabilities (excluding acquisitions):
Accounts receivable	(2,391)	(92,305)	(15,773)
Inventories	(77,421)	(56,619)	(15,582)
Prepaid expenses and other assets	(14,197)	(13,888)	719
Accounts payable	(40,736)	67,138	28,625
Accrued liabilities	29,575	63,075	26,016
Long-term liabilities and other	16,659	7,133	3,950
Net cash provided by operating activities	466,508	419,333	341,209
Cash flows from investing activities:
Purchases of property, plant & equipment	(138,197)	(115,027)	(51,976)
Proceeds from dispositions of property, plant & equipment	3,835	4,682	347
Proceeds from notes receivable			8,367
Equity investment in joint venture	(50,402)
Acquisitions, net of cash acquired		(5,039)	(557,651)
Other	1,271	(1,271)	(560)
Net cash used in investing activities	(183,493)	(116,655)	(601,473)
Cash flows from financing activities:
Borrowings on revolving credit facility			360,000
Principal payments on revolving credit facility	(145,000)	(215,000)
Payments of debt issuance costs			(7,850)
Cash dividends paid	(77,989)	(69,409)	(62,970)
Payments related to vesting of stock-based awards	(7,657)	(4,572)	(2,484)
Excess tax benefits from stock-based awards			320
Principal payments on capital lease obligations	(378)	(341)	(328)
Net cash provided by (used in) financing activities	(231,024)	(289,322)	286,688
Net increase in cash and cash equivalents	51,991	13,356	26,424
Cash and cash equivalents, beginning of year	223,258	209,902	183,478
Cash and cash equivalents, end of year	275,249	223,258	209,902
Supplemental cash flow information:
Income taxes paid	218,841	198,619	128,409
Interest paid	3,901	8,558	672
Non-cash transactions:
Capital expenditures in accounts payable	$ 5,375	$ 6,266	$ 3,538