Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Change in projected benefit obligations:
Projected benefit obligations at beginning of the year	$ 395.4	$ 445.2
Service cost pertaining to benefits earned during the year	7.2us-gaap_DefinedBenefitPlanServiceCost	9.0us-gaap_DefinedBenefitPlanServiceCost	7.7us-gaap_DefinedBenefitPlanServiceCost
Interest cost on projected benefit obligations	20.3us-gaap_DefinedBenefitPlanInterestCost	18.8us-gaap_DefinedBenefitPlanInterestCost	15.3us-gaap_DefinedBenefitPlanInterestCost
Actuarial (gains) losses	66.2	(62.3)
Benefits paid to plan participants	(32.2)us-gaap_DefinedBenefitPlanBenefitsPaid	(15.3)us-gaap_DefinedBenefitPlanBenefitsPaid
Settlements	(24.0)	0
Projected benefit obligations at end of the year	432.9	395.4	445.2
Change in fair value of pension assets:
Fair value of pension assets at beginning of the year	319.6	277.3
Actual return on plan assets	32.5	53.1
Benefits paid to plan participants	(32.2)us-gaap_DefinedBenefitPlanBenefitsPaid	(15.3)us-gaap_DefinedBenefitPlanBenefitsPaid
Settlements	(24.0)	0
Fair value of pension assets at end of the year	302.1	319.6	277.3
Funded status	(130.8)	(75.8)
Amounts recognized in the consolidated balance sheets:
Non-current assets	1.1	2.3
Current liabilities	(3.8)	(3.9)
Non-current liabilities	(128.1)	(74.2)
Net amount recognized	(130.8)	(75.8)
Amounts recognized in accumulated other comprehensive loss:
Unrecognized net actuarial loss (amounts net of tax: $(41.5) and $(9.3))	(62.6)	(13.1)
Unrecognized prior service cost (amounts net of tax: $(0.1) and $(0.2))	(0.1)	(0.2)
Net amount recognized	(62.7)	(13.3)
Funded status of pension plans and SERP (supplemental):
Funded status of qualified defined benefit plans and SERP	(130.8)	(75.8)
Nonqualified trust assets	59.5	55.3
Net funded status of pension plans and SERP (supplemental)	(77.4)	(26.4)
Pension [Member]
Change in fair value of pension assets:
Company contributions	3.9	2.4
SERP [Member]
Change in fair value of pension assets:
Company contributions	2.3	2.1
Funded status of pension plans and SERP (supplemental):
Nonqualified trust assets	$ 53.4	$ 49.4

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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Defined benefit plan funded status of pension plan and SERP.

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