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Debt - U.S. Trade Accounts Receivable Securitization (Details) - USD ($) $ in Thousands		5 Months Ended	9 Months Ended		12 Months Ended
	Apr. 17, 2013	Jun. 01, 2016	Sep. 24, 2016	Sep. 26, 2015	Dec. 26, 2015
Debt Instrument [Line Items]
Repayments of Long-term Debt			$ 9,293	$ 70,585
Long-term Debt and Capital Lease Obligations, Including Current Maturities			735,484		$ 481,083
Butler Schein Animal Health Debt [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 220,000
U.S. trade accounts receivable securitization [Member]
Debt Instrument [Line Items]
Debt Instrument Maximum Borrowing Capacity	$ 300,000		350,000
Debt Instrument, Maturity Date		Apr. 29, 2019
Long-term Debt and Capital Lease Obligations, Including Current Maturities			$ 350,000		$ 90,000
Pricing commitment period			3 years
Commitment fee for facility usage - facility limit greater than or equal to fifty percent usage (as a percent)			0.30%
Commitment fee for facility usage - facility limit less than fifty percent usage (as a percent)			0.35%
Debt instrument borrowing percentage of facility used for calculating commitment fee (in hundredths)			50.00%
U.S. trade accounts receivable securitization [Member] | Average Asset Backed Commercial Paper Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate at period end			1.59%		1.15%
Debt instrument, variable rate basis at period end			0.84%		0.40%
Debt instrument, basis spread on variable rate			0.75%		0.75%

X

- Definition

Commitment fee under our asset-backed securitization program, in number of basis points, on the daily balance of the unused portion of the facility if usage is less than to 50% of the facility limit.

+ References

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- Definition

Commitment fee under our asset-backed securitization program, in number of basis points, on the daily balance of the unused portion of the facility if usage is greater than or equal to 50% of the facility limit.

+ References

No definition available.

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- Definition

The percentage of the total available commitment under a debt instrument that is used to determine the level of commitment fee to be paid.

+ References

No definition available.

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- Definition

The maximum amount which can be borrowed under a debt instrument.

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- Definition

The actual interest rate at period end for the reference rate used to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Period for which the pricing is committed under the asset-backed securitization program.

+ References

No definition available.

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- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of long-term debt and capital lease obligations including current maturities.

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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