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Note 11 - Common Stock and Earnings Per Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 18, 2019	May 17, 2019	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Common Stock, Dividends, Per Share, Cash Paid		$ 0.72
Payments of Dividends, Total					$ 75,769	$ 65,037
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation					27,852	5,563
Payment, Tax Withholding, Share-based Payment Arrangement					$ 6,200	$ 1,000
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			1,810	0	1,810	0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0		0
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			206,417	249,443	206,417	249,443
Subsequent Event [Member]
Payments of Dividends, Total	$ 27,500