Commitments and Contingencies (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 28, 2017 USD ($) item	Dec. 27, 2016 USD ($) item
Other Commitments and Contingencies
Estimated cost to complete capital project commitments (in dollars)	$ 152.4	$ 157.5
Number of suppliers providing most of the company's beef \| item	3
Estimated loss contingency recorded during period	$ 9.2
Lease Agreements
Real estate lease agreements
Number of leases entity contingently liable \| item	7	7
Lease Agreements \| Maximum
Real estate lease agreements
Contingently liable amount	$ 16.2	$ 16.4
U.S. Equal Employment Opportunity Commission
Other Commitments and Contingencies
Estimated loss contingency, net of tax	9.2
Real estate lease agreements
Contingently liable amount	12.0
Estimated loss contingency, net of tax	9.2
U.S. Equal Employment Opportunity Commission \| General and administrative expense
Real estate lease agreements
Total pre-tax charge	14.9
Settlement amount	12.6
Pre-tax charge associated with the legal fees	$ 2.3
Everett, Massachusetts \| Lease Agreements
Real estate lease agreements
Ownership percentage	5.00%
Fargo, North Dakota \| Lease Agreements
Real estate lease agreements
Ownership percentage	5.00%

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The amount of pre tax loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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Estimated loss contingency, net of tax recorded during period.

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Represents the number of leases of the entity where entity is contingently liable.

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Represents the number of suppliers providing most of the supplies of beef for the entity's restaurants.

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
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Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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