Note 7 - Closures and Impairments Expense, Including Trademark Impairments - Future Liabilites Associated with Closed Properties (Details) $ in Thousands	9 Months Ended
Feb. 28, 2017 USD ($)
Balance	$ 6,270
Closing expense including rent and other lease charges	17,445
Payments	(13,772)
Adjustments to deferred escalating minimum rent and other	9,196
Balance	$ 19,139

Amount of cash paid during the period to settle lease obligations associated with closed properties.

No definition available.

Name:	rt_PaymentsClosedPropertyLeaseObligation
Namespace Prefix:	rt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration