Covenant Ratio - Maximum Leverage

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- Definition

Covenant Ratio - Maximum Leverage At End Of Each Next Two Fiscal Quarters Immediately Following Viewpoint Acquisition

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- Definition

Covenant Ratio - Maximum Leverage At End Of Fiscal Quarter During Which Material Acquisition Occurs And Each Three Immediately Following Fiscal Quarters

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- Definition

Covenant Ratio - Maximum Leverage At End of Fiscal Quarter If Viewpoint Acquisition Occurs And Three Fiscal Quarters Immediately Following Such Fiscal Quarter

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- Definition

Covenant Ratio - Minimum Interest Coverage

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Credit facility, Variable Rate Basis Plus Percentage

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- Definition

Exceeding Cash Consideration For Material Acquisition As Defined

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Interest Payable Periods On Borrowings

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Number Of Revolving Loan Facilities

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- Definition

One Month Variable Interest Periods

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Six Month Variable Interest Periods

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Three Month Variable Interest Periods

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Two Month Variable Interest Periods

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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

Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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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

Percentage of principal amount of debt redeemed.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Maturity period on variable rate advances made and reported by Federal Home Loan Bank (FHLBank), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

Fair value of the amount outstanding under the credit facility.

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- Definition

Amount of the required periodic payment applied to interest.

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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Debt (Narrative) (Detail) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended
Debt (Narrative) (Detail) $ in Millions	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