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Leases (Details2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2011	Dec. 28, 2010	Dec. 29, 2009
Rent expense for operating leases
Rent expense, occupancy	$ 23,150	$ 21,361	$ 20,018
Rent expense	26,163	23,974	22,432
Occupancy
Rent expense for operating leases
Minimum rent	22,532	20,843	19,574
Contingent rent	618	518	444
Rent expense, occupancy	23,150	21,361	20,018
Equipment and other
Rent expense for operating leases
Minimum rent	$ 3,013	$ 2,613	$ 2,414

X

- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

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X

- Definition

The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.

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- Definition

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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