Commitments and Contingencies (Details Textual)	Jun. 01, 2016 contract
Commitments and Contingencies Disclosure [Abstract]
Number of Non-cancelable Contracts	4

The number of non-cancelable contracts entered into by the company as of a specified date.

No definition available.

Name:	lub_NumberOfNoncancelableContracts
Namespace Prefix:	lub_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant