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Debt (Senior Secured Credit Facilities) (Details) | Jul. 10, 2018 USD ($) | Nov. 30, 2017 | Oct. 27, 2015 USD ($) loan_facility | Dec. 28, 2018 USD ($)
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Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate |  |  |  | 5.27%
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | $ 31,300,000 |  |  |
Senior Notes [Member] | Senior Secured Credit Facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of debt | 188,000,000 |  |  |
Secured Debt [Member] | Senior Secured Credit Facilities [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
First lien net leverage ratio |  |  | 4.25 |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 200,000,000 |
Debt maturity date |  |  | Oct. 27, 2020 |
Outstanding borrowings |  |  |  | $ 5,000,000
Remaining borrowing capacity |  |  |  | 188,200,000
Outstanding standby letters of credit |  |  |  | $ 6,800,000
Weighted average interest rate |  |  |  | 5.01%
Repayment of debt | 74,000,000 |  |  |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unused capacity commitment fee |  |  | 0.175% |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unused capacity commitment fee |  |  | 0.25% |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 0.75% |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] | Prime Rate [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 2.25% |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 1.75% |
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 3.25% |
Secured Debt [Member] | Loans Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of additional term loan facilities that may be added (one or more) | loan_facility |  |  | 1 |
Secured Debt [Member] | Loans Payable [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
First lien net leverage ratio |  |  | 4.25 |
Secured Debt [Member] | Loans Payable [Member] | Term Loan A (TLA) Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principle amount |  |  | $ 305,000,000 |
Debt maturity date |  |  | Oct. 27, 2021 |
Weighted average interest rate |  |  |  | 5.01%
Maximum leverage ratio |  |  | 5.50 |
Adjusted EBITDA to interest expense ratio |  |  | 2.75 |
Secured Debt [Member] | Loans Payable [Member] | Term Loan A (TLA) Facility [Member] | Prime Rate [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 0.75% |
Secured Debt [Member] | Loans Payable [Member] | Term Loan A (TLA) Facility [Member] | Prime Rate [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 2.25% |
Secured Debt [Member] | Loans Payable [Member] | Term Loan A (TLA) Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 1.75% |
Secured Debt [Member] | Loans Payable [Member] | Term Loan A (TLA) Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 3.25% |
Secured Debt [Member] | Loans Payable [Member] | Term Loan B (TLB) Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principle amount |  |  | $ 632,000,000 |
Discount percent |  |  | 1.00% |
Debt maturity date |  |  | Oct. 27, 2022 |
Weighted average interest rate |  |  |  | 5.39%
Debt fair value |  |  |  | $ 616,000,000
Repayment of debt | $ 114,000,000 |  |  |
Secured Debt [Member] | Loans Payable [Member] | Term Loan B (TLB) Facility [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable rate |  |  | 2.00% |
Secured Debt [Member] | Loans Payable [Member] | Term Loan B (TLB) Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Reduction to interest rate margins |  | 1.00% |  |
Spread on variable rate |  |  | 3.00% |
Interest rate floor |  |  | 1.00% |
Secured Debt [Member] | Loans Payable [Member] | Term Loan B (TLB) Facility [Member] | Base Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Reduction to interest rate margins |  | 1.00% |  |
Secured Debt [Member] | Swingline Loans [Member] | New Revolving Credit Facility 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 15,000,000 |
Secured Debt [Member] | Standby Letters of Credit [Member] | New Revolving Credit Facility 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 25,000,000 |

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- Definition Debt Instrument, Covenant Compliance, Adjusted EBITDA To Interest Expense Ratio + References No definition available. + Details
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- Definition Debt Instrument, Covenant Compliance, First Lien Net Leverage Ratio + References No definition available. + Details
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- Definition Debt Instrument, Covenant Compliance, Maximum Leverage Ratio + References No definition available. + Details
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- Definition Debt Instrument, Covenant Compliance, Number Of Additional Term Loan Facilities That May Be Added + References No definition available. + Details
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- Definition Debt Instrument, Discount, Percentage + References No definition available. + Details
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- Definition Debt Instrument, Increase (Decrease) In Basis Spread On Variable Rate + References No definition available. + Details
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- Definition Debt Instrument, Interest Rate, Floor + References No definition available. + Details
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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + 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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- 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/disclosureRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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