The number of derivative contracts entered into during the period.

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

+ Details

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Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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Debt (Details) $ in Millions	6 Months Ended	12 Months Ended
Debt (Details) $ in Millions	Jun. 25, 2017 USD ($) derivative	Dec. 27, 2015 derivative
Interest rate swap, July 2013 1.42% fixed
Interest rate swaps
Interest rate swap agreement, fixed interest rate	1.42%
Interest rate swap agreement, notional amount	$ 75.0
Interest rate swap, December 2014 1.36% fixed
Interest rate swaps
Interest rate swap agreement, fixed interest rate	1.36%
Interest rate swap agreement, notional amount	$ 50.0
Interest rate swap, April 2018, 2.33% fixed
Interest rate swaps
Interest rate swap agreement, fixed interest rate	2.33%
Interest rate swap agreement, notional amount	$ 55.0
Interest rate swap, April 2018, 2.36% fixed
Interest rate swaps
Interest rate swap agreement, fixed interest rate	2.36%
Interest rate swap agreement, notional amount	$ 35.0
Interest rate swap, April 2018, 2.34% fixed
Interest rate swaps
Interest rate swap agreement, fixed interest rate	2.34%
Interest rate swap agreement, notional amount	$ 35.0
Interest rate swap
Interest rate swaps
Number of derivatives held \| derivative	2
Number of additional derivatives executed \| derivative		3
Interest rate swap agreement, notional amount	$ 125.0
Revolving credit facility
Debt
Line of credit facility, maximum borrowing capacity	500.0
Line of credit facility, remaining availability	$ 164.2
Revolving credit facility \| Minimum
Debt
Percentage of commitment fee on unused credit facility	0.15%
Revolving credit facility \| Maximum
Debt
Percentage of commitment fee on unused credit facility	0.25%
Revolving credit facility \| LIBOR \| Minimum
Debt
Interest margin rate on debt	0.75%
Revolving credit facility \| LIBOR \| Maximum
Debt
Interest margin rate on debt	1.75%