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Long-Term Debt and Capital Lease Obligations (Additional Disclosures) (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 26, 2015 USD ($) | Apr. 30, 2015 USD ($) payment | Mar. 31, 2015 USD ($) | Dec. 27, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,300,000,000.0 | $ 1,300,000,000.0 | $ 970,000,000 |
Term loan facility |  | 400,000,000.0 |  |
Line of credit facility, maximum borrowing facility |  | $ 900,000,000.0 |  |
Number of quarterly installment payments | payment |  | 20 |  |
Debt, weighted average interest rate | 1.33% |  |  | 1.42%
EBITDA less capital expenditures to cash interest expense covenant ratio | 3.5 |  |  |
Indebtedness to EBITDA covenant ratio | 3.5 |  |  |
Capital lease obligations | $ 33,600,000 |  |  | $ 1,000,000
Argenta and BioFocus UK | Financing Obligation |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital lease obligations | 35,800,000 |  |  |
Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding under letters of credit | $ 4,900,000 |  |  | $ 5,000,000
Federal Funds Effective Swap Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin (as a percent) | 0.50% |  |  |
LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate margin (as a percent) | 1.00% |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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