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Common Stock and Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 19, 2020	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019	Nov. 30, 2019	Nov. 30, 2018
Dividends per share of common stock (in USD per share)		$ 0.72	$ 0.64	$ 0.72	$ 0.64	$ 0.72	$ 0.64
Dividend payments				$ 54,363	$ 48,442
Subsequent event
Dividend payments	$ 27,100
Stock options
Antidilutive securities excluded from computation of earnings per share (in shares)		18,065	447,709
Performance shares
Antidilutive securities excluded from computation of earnings per share (in shares)		36,501	206,417