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Debt - Private Placement Borrowings (Details) - USD ($) $ in Thousands			9 Months Ended
		Aug. 10, 2010	Sep. 24, 2016	Dec. 26, 2015
Debt Instrument [Line Items]
Total long-term debt			$ 735,484	$ 481,083
Private Placement Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date		Aug. 10, 2010
Total long-term debt			$ 342,857	$ 350,000
Debt Instrument, Maturity Date			Sep. 22, 2017
Private Placement Facilities [Member] | Private placement facilities maturing in September 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			Sep. 02, 2010
Total long-term debt			$ 100,000
Borrowing Rate			3.79%
Debt Instrument, Maturity Date			Sep. 02, 2020
Private Placement Facilities [Member] | Private placement facilities maturing in January 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			Jan. 20, 2012
Total long-term debt			$ 50,000
Borrowing Rate			3.45%
Debt Instrument, Maturity Date			Jan. 20, 2024
Private Placement Facilities [Member] | Private placement facilities maturing in January 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	[1]		Jan. 20, 2012
Total long-term debt	[1]		$ 42,857
Borrowing Rate	[1]		3.09%
Debt Instrument, Maturity Date	[1]		Jan. 20, 2022
Private placement facility, frequency of periodic payment			Annual
Private placement facility annual payment			$ 7,100
Debt Instrument, Date of First Required Payment			Jan. 20, 2016
Private Placement Facilities [Member] | Private placement facilities maturing in December 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			Dec. 24, 2012
Total long-term debt			$ 50,000
Borrowing Rate			3.00%
Debt Instrument, Maturity Date			Dec. 24, 2024
Private Placement Facilities [Member] | Private placement facilities maturing in June 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			Jun. 02, 2014
Total long-term debt			$ 100,000
Borrowing Rate			3.19%
Debt Instrument, Maturity Date			Jun. 02, 2021
[1] Annual repayments of approximately $7.1 million for this borrowing commenced on January 20, 2016.

X

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Topic 210
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-Topic 210
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-Section S99
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