Calculation of Earnings Per Share - Additional Information (Details)	3 Months Ended	6 Months Ended
	Nov. 30, 2019 shares	Nov. 28, 2020 Vote shares	Nov. 30, 2019 shares
Schedule Of Earning Per Share [Line Items]
Limit of cash dividends Class B common stock (percent)		90.00%
Common stock options anti-dilutive	860,000	1,600,000	916,000
Common Stock
Schedule Of Earning Per Share [Line Items]
Common stock shares, authorized		17,000,000
Common Class B
Schedule Of Earning Per Share [Line Items]
Common stock shares, authorized		3,000,000
Number of votes per share | Vote		10