Note 11 - Segment Reporting (Details Textual)	12 Months Ended
May 31, 2016	Jun. 03, 2014
Lime Fresh [Member]
Sale of Assets, Number of Buyers	2
Number of Restaurants Closed	11
Sale of Assets, Number of Restaurants Remaining to Be Closed and Transferred to the Buyer	2
Number of Restaurants Closed		33

Represents the number of restaurants, which are part of the specified disposal group, that remain to be closed and transferred to the buyer.

No definition available.

Name:	rt_SaleOfAssetsNumberOfRestaurantsRemainingToBeClosedAndTransferredToTheBuyer
Namespace Prefix:	rt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant