CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Statement of Cash Flows [Abstract]
Net income	$ 33,481	$ 37,498
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,635	5,634
Stock-based compensation expense	3,574	3,618
Deferred income taxes	(1,175)	1,009
Income (Loss) from Equity Method Investments	174	0
Other Noncash Income (Expense)	(266)	1,533
Changes in operating assets and liabilities (net of effects of business acquisitions/divestitures):
Accounts receivable	(11,371)	(4,362)
Inventories	14,758	249
Prepaid expenses and other assets	(1,398)	(1,404)
Accounts payable and accrued liabilities	17,363	(5,193)
Income taxes	2,063	266
Net cash provided by operating activities	62,838	38,848
Investing activities:
Purchases of property, plant and equipment	(9,321)	(7,724)
Other	119	527
Net cash used in investing activities	(9,202)	(7,197)
Financing activities:
Payment of dividends	(11,391)	(11,533)
Proceeds from exercise of stock options	160	3,411
Payments for employee taxes withheld from stock-based awards	(2,617)	(7,269)
Purchase of treasury stock	(2,720)	0
Other	17	65
Net cash used in financing activities	(16,551)	(15,326)
Effect of exchange rate changes on cash and cash equivalents	1,605	(304)
Net increase in cash and cash equivalents	38,690	16,021
Cash and cash equivalents, beginning of period	217,643	279,072
Cash and cash equivalents, end of period	$ 256,333	$ 295,093