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Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Change in projected benefit obligations:
Projected benefit obligations at beginning of the year	$ 432.9	$ 395.4
Service cost pertaining to benefits earned during the year	9.0	7.2	$ 9.0
Interest cost on projected benefit obligations	18.5	20.3	18.8
Actuarial (gains) losses	(50.1)	66.2
Benefits paid to plan participants	(17.5)	(32.2)
Settlements	0.0	(24.0)
Projected benefit obligations at end of the year	392.8	432.9	395.4
Change in fair value of pension assets:
Fair value of pension assets at beginning of the year	302.1	319.6
Actual return on plan assets	(6.2)	32.5
Benefits paid to plan participants	(17.5)	(32.2)
Settlements	0.0	(24.0)
Fair value of pension assets at end of the year	280.8	302.1	$ 319.6
Funded status	(112.0)	(130.8)
Amounts recognized in the consolidated balance sheets:
Non-current assets	1.6	1.1
Current liabilities	(4.0)	(3.8)
Non-current liabilities	(109.6)	(128.1)
Net amount recognized	(112.0)	(130.8)
Amounts recognized in accumulated other comprehensive loss:
Unrecognized net actuarial loss (amounts net of tax: $(12.7) and $(41.5))	(18.2)	(62.6)
Unrecognized prior service cost (amounts net of tax: $(0.1) and $(0.1))	(0.1)	(0.1)
Net amount recognized	(18.3)	(62.7)
Funded status of pension plans and SERP (supplemental):
Funded status of qualified defined benefit plans and SERP	(112.0)	(130.8)
Nonqualified trust assets	64.6	59.5
Net funded status of pension plans and SERP (supplemental)	(53.6)	(77.4)
Pension [Member]
Change in fair value of pension assets:
Company contributions	0.0	3.9
SERP [Member]
Change in fair value of pension assets:
Company contributions	2.4	2.3
Funded status of pension plans and SERP (supplemental):
Nonqualified trust assets	$ 58.4	$ 53.4

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- Definition

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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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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Amount of contributions made by the employer to defined benefit plans.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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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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