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Debt (Narrative) (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 23, 2018 | May 31, 2018 | Jun. 29, 2018 USD ($) loan | Jun. 29, 2018 USD ($) loan | May 15, 2018 USD ($) | May 01, 2018 USD ($) | Dec. 29, 2017 USD ($) | Nov. 24, 2014 USD ($)
Senior Notes | 2023 Senior Notes, 4.15%, due June 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Principal |  |  | $ 300.0 | $ 300.0 |  |  | $ 0.0 |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 4.15% | 4.15% |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 99.964% |  |  |  |
Debt Issuance Costs, Gross |  |  | $ 0.9 | $ 0.9 |  |  |  |
Senior Notes | 2028 Senior Notes, 4.9%, due June 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Principal |  |  | $ 600.0 | $ 600.0 |  |  | 0.0 |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 4.90% | 4.90% |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 99.867% |  |  |  |
Debt Issuance Costs, Gross |  |  | $ 1.8 | $ 1.8 |  |  |  |
Senior Notes | 2024 Senior Notes, 4.75%, due December 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Principal |  |  | 400.0 | 400.0 |  |  | 400.0 | $ 400.0
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  |  |  |  |  |  | 4.75%
Debt Issuance Costs, Gross |  |  | 3.0 | 3.0 |  |  |  |
Revolving Credit Facility | Two Thousand Eighteen Interim Credit Facilities [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of Debt |  |  | 300.0 |  |  |  |  |
Revolving Credit Facility | 2014 Credit Facility, floating rate, retired |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | $ 0.0 | 0.0 |  |  | 389.0 |
Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Covenant Ratio - Minimum Interest Coverage |  |  | 3.50 |  |  |  |  |
Covenant Ratio - Maximum Leverage |  |  | 3.50 |  |  |  |  |
Covenant Ratio - Maximum Leverage At End of Fiscal Quarter If Viewpoint Acquisition Occurs And Three Fiscal Quarters Immediately Following Such Fiscal Quarter |  |  | 4.25 |  |  |  |  |
Covenant Ratio - Maximum Leverage At End Of Each Next Two Fiscal Quarters Immediately Following Viewpoint Acquisition |  |  | 3.75 |  |  |  |  |
Exceeding Cash Consideration For Material Acquisition As Defined |  |  | $ 100.0 |  |  |  |  |
Covenant Ratio - Maximum Leverage At End Of Fiscal Quarter During Which Material Acquisition Occurs And Each Three Immediately Following Fiscal Quarters |  |  | 3.75 |  |  |  |  |
Promissory Notes And Other Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Promissory Notes and Other Debt, Current and Noncurrent |  |  | $ 1.3 | 1.3 |  |  | 1.2 |
Promissory Notes And Other Notes, Noncurrent |  |  | 0.9 | 0.9 |  |  | 0.8 |
Revolving Credit Facility | Uncommitted Facilities, floating rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 75.0 | $ 75.0 |  |  |  |
Number Of Revolving Loan Facilities | loan |  |  | 2 | 2 |  |  |  |
Short-term Debt |  |  | $ 0.0 | $ 0.0 |  |  | $ 128.0 |
Short-term Debt, Weighted Average Interest Rate, at Point in Time |  |  |  |  |  |  | 2.24% |
Revolving Credit Facility | Uncommitted Facility Two [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | 75.0 | 75.0 |  |  |  |
Waterfall Holdings [Member] | Unsecured Bridge Term Loan [Member] | Bridge Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Principal |  |  | 1,200.0 | 1,200.0 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 700.0 |  |
Line of Credit Facility, Periodic Payment, Interest |  |  | 5.8 |  |  |  |  |
Debt Instrument, Term | 364 days |  |  |  |  |  |  |
Waterfall Holdings [Member] | Unsecured Bridge Term Loan [Member] | Backstop Revolving Credit Facility In Case Of One Lender [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Principal |  |  | 1,000.0 | 1,000.0 |  |  |  |
JPMorgan Chase Bank, N.A. [Member] | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  | 4.8 | 4.8 |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | $ 1,750.0 |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | $ 0.0 | $ 0.0 |  |  |  |
JPMorgan Chase Bank, N.A. [Member] | Revolving Credit Facility | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | 1,250.0 |  |  |
Debt Instrument, Term |  | 5 years |  |  |  |  |  |
JPMorgan Chase Bank, N.A. [Member] | Delayed Draw Term Loan [Member] | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | 500.0 |  |  |
Debt Instrument, Term |  | 3 years |  |  |  |  |  |
JPMorgan Chase Bank, N.A. [Member] | Additional Loan Facility [Member] | Unsecured Debt [Member] | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | $ 500.0 |  |  |
Federal Funds Effective Swap Rate [Member] | Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, Variable Rate Basis Plus Percentage |  |  | 1.00% |  |  |  |  |
Reserve Adjusted One Month LIBOR [Member] | Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.50% |  |  |  |  |
Maturity Period, Variable Rate |  |  | 1 month |  |  |  |  |
Reserve Adjusted One Month LIBOR [Member] | Revolving Credit Facility | Minimum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.00% |  |  |  |  |
Reserve Adjusted One Month LIBOR [Member] | Revolving Credit Facility | Maximum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.875% |  |  |  |  |
Adjustment LIBOR Rate One, Two, Three Or Six Month Interest Periods [Member] | Revolving Credit Facility | Minimum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |
Adjustment LIBOR Rate One, Two, Three Or Six Month Interest Periods [Member] | Revolving Credit Facility | Maximum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.875% |  |  |  |  |
Adjusted EURIBOR Rate, One, Two, Three Or Six Months Interest Periods [Member] | Revolving Credit Facility | Minimum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |
Adjusted EURIBOR Rate, One, Two, Three Or Six Months Interest Periods [Member] | Revolving Credit Facility | Maximum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.875% |  |  |  |  |
EURIBOR Rate | Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
One Month Variable Interest Period |  |  | 1 month |  |  |  |  |
Two Month Variable Interest Periods |  |  | 2 months |  |  |  |  |
Three Month Variable Interest Periods |  |  | 3 months |  |  |  |  |
Six Month Variable Interest Periods |  |  | 6 months |  |  |  |  |
EURIBOR Rate | Revolving Credit Facility | Maximum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Payable Periods On Borrowings |  |  | 3 months |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
One Month Variable Interest Period |  |  | 1 month |  |  |  |  |
Two Month Variable Interest Periods |  |  | 2 months |  |  |  |  |
Three Month Variable Interest Periods |  |  | 3 months |  |  |  |  |
Six Month Variable Interest Periods |  |  | 6 months |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility | Maximum | 2018 Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest Payable Periods On Borrowings |  |  | 3 months |  |  |  |  |

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