Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 30, 2014		Aug. 31, 2013	Aug. 30, 2014 Treasury Stock [Member]	Aug. 30, 2014 Paid In Capital [Member]	Aug. 30, 2014 Accumulated Other Comprehensive Loss [Member]	Aug. 30, 2014 Retained Earnings [Member]		Aug. 30, 2014 Noncontrolling Interests [Member]	Aug. 30, 2014 Common Stock [Member]	May 31, 2014 Common Stock [Member]	Aug. 30, 2014 Class A Common Stock [Member]	May 31, 2014 Class A Common Stock [Member]
Schedule of Stockholders Equity [Line Items]
Balance	$ 594,745			$ (20,453)	$ 40,476	$ 561	$ 572,874		$ 912	$ 351	$ 351	$ 24	$ 24
Dividends	(9,219)	[1]					(9,219)	[1]
Other comprehensive income	(10)		(46)			(10)
Distribution to noncontrolling interest partners	(429)								(429)
Proceeds from stock option exercise	60			16	44
Restricted stock compensation expense	464				464
Net income	28,185		8,898				27,655		530
Balance	$ 613,796			$ (20,437)	$ 40,984	$ 551	$ 591,310		$ 1,013	$ 351	$ 351	$ 24	$ 24
Percentage of net income used to compute accrued dividends	33.33%

[1] Dividends are calculated as 1/3 of net income after prior period loss (includes adjustment for actual dividends paid based on accrual from previous period).