Discounted Lease Rentals: (Details)	Sep. 26, 2015
Discounted Lease Rentals:
Weighted average interest rate on a non-recourse basis (as a percent)	3.25%

Weighted average interest rate of debt outstanding.

No definition available.

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant