Additional common stock units for election of deferred annual incentive award, percentage.

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Age for eligible employee.

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Amount of annual incentive award payment participant can elect to defer.

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Fraction of restricted stock award vesting on anniversary.

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Installments in which restricted stock units vest and are converted to common stock.

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Number of anniversaries of grant date upon which restricted stock units vest.

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- Definition

Stock option exercise price as percentage of market value.

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The period in which a stock option can be exercised.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Stock-Based Compensation - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Sep. 29, 2018 USD ($) Anniversaries Installment shares	Sep. 30, 2017 USD ($)	May 08, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercise prices as percentage of the market value on the date of the grant			100.00%
Compensation expenses for stock options	$ 0.3	$ 0.4	$ 4.3	$ 7.9
Omnibus Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, common stock available for grant \| shares	6.0		6.0		13.0
Inactive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance \| shares	1.9		1.9
Restricted Stock [Member] \| LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of restricted stock award vesting on anniversary			0.333%
Eligible age of officer for restricted stock award			55 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 53.9		$ 53.9
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years
Number of anniversaries of grant date upon which restricted stock units vest \| Anniversaries			3
Installments in which restricted stock units vest and are converted to common stock \| Installment			3
Compensation expense	$ 8.5	6.1	$ 46.8	32.2
Restricted Stock Units [Member] \| AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible age of officer for restricted stock award			55 years
Amount of annual incentive award payment participant can elect to defer			50.00%
Additional common stock units for election of deferred annual incentive award, percentage			25.00%
Restricted Stock Awards and Units [Member] \| AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	2.0		$ 2.0
Weighted-average recognition period for unrecognized compensation expense related to stock (years)			1 year 9 months 18 days
Compensation expense	4.9	$ 3.6	$ 14.6	$ 11.1
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			3 years
Stock options term, years			10 years
Unrecognized compensation expense related to stock	$ 1.9		$ 1.9
Weighted-average recognition period for unrecognized compensation expense related to stock (years)			1 year 10 months 24 days