CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Statement of Cash Flows [Abstract]
Net earnings	$ 30,637	$ 25,836
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,960	6,564
Non-cash portion of stock-based compensation expense	4,965	3,744
Deferred income taxes	2,164	(1,168)
Changes in operating assets and liabilities (net of effects of business acquisitions/divestitures):
Accounts receivable	(6,709)	(4,807)
Inventories	(3,125)	(3,571)
Prepaid expenses and other assets	(2,197)	(2,005)
Accounts payable and accrued liabilities	(14,070)	7,799
Income taxes	1,193	2,327
Net cash provided by operating activities	18,818	34,719
Investing activities:
Purchases of property, plant and equipment	(6,009)	(3,802)
Other	337	974
Net cash used in investing activities	(5,672)	(2,828)
Financing activities:
Payment of dividends	(11,096)	(10,639)
Proceeds from exercise of stock options	12,138	3,249
Proceeds from borrowing on credit facilities	5,737	10,901
Debt issuance costs	(2,269)	(22,894)
Income tax on equity-based compensation, and other	(3,846)	(2,280)
Net cash provided by (used in) financing activities	664	(21,663)
Effect of exchange rate changes on cash	(3,061)	(1,935)
Net increase in cash and cash equivalents	10,749	8,293
Cash and cash equivalents, beginning of period	181,427	133,944
Cash and cash equivalents, end of period	$ 192,176	$ 142,237