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Fair Value Measurements (Installment Loan) (Details) - USD ($) $ in Thousands	Dec. 27, 2016	Dec. 29, 2015
Carrying Amount
Carrying amount and Fair value of financial instruments
Installment loan	$ 550	$ 694
Fair Value | Level 2
Carrying amount and Fair value of financial instruments
Installment loan	$ 599	$ 779

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