Calculation of Earnings Per Share - Additional Information (Details)	3 Months Ended	6 Months Ended
	Dec. 01, 2018 shares	Dec. 01, 2018 Number shares
Schedule Of Earning Per Share [Line Items]
Limit of cash dividends Class B common stock (percent)		90.00%
Common stock options anti-dilutive	117,000
Common Stock
Schedule Of Earning Per Share [Line Items]
Common stock shares, authorized	17,000,000	17,000,000
Common Class B
Schedule Of Earning Per Share [Line Items]
Common stock shares, authorized	3,000,000	3,000,000
Number of votes per share | Number		10