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Commitments and Contingencies (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2015 patent	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)	Dec. 28, 2013 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Rent expense from operating leases		$ 23.4	$ 14.2	$ 16.7
Maximum insurance deductibles		5.0
Government Billing
Litigation [Line Items]
Loss contingency, estimate of possible loss		$ 1.5
Pending Litigation | Idexx
Litigation [Line Items]
Patents allegedly infringed, number | patent	3

X

- Definition

[Line Items] for Litigation [Table]

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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- Definition

Number of another entity's patents that the entity has allegedly infringed.

+ References

No definition available.

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- Definition

Amount of risk retained by the entity before the insurance arrangement begins to provide coverage.

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