Income Per Share - Schedule of Computation of Basic Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Feb. 23, 2019	Nov. 24, 2018	Feb. 29, 2020	Feb. 23, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available to shareholders	$ 34,680	$ 48,242	$ 47,606	$ 38,320	$ 82,922	$ 85,926
Allocation of net income for Basic:
Common stock	$ 34,680		$ 47,606		$ 82,922	$ 85,926
Weighted average number of shares for Basic:
Common stock (in shares)	18,936		19,138		18,943	19,140
Common Stock
Allocation of net income for Basic:
Common stock	$ 29,129		$ 39,923		$ 69,654	$ 72,061
Weighted average number of shares for Basic:
Common stock (in shares)	15,293		15,428		15,300	15,430
Income per share for Basic:
Common stock (in dollars per share)	$ 1.90		$ 2.59		$ 4.55	$ 4.67
Class B Common Stock
Allocation of net income for Basic:
Common stock	$ 5,551		$ 7,683		$ 13,268	$ 13,865
Weighted average number of shares for Basic:
Common stock (in shares)	3,643		3,710		3,643	3,710
Income per share for Basic:
Common stock (in dollars per share)	$ 1.52		$ 2.07		$ 3.64	$ 3.74