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Postretirement Plans - Narratve (Detail) $ in Millions	12 Months Ended
	Dec. 29, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate, pre-65	5.70%
Health care cost trend rate, post-65	6.30%
U.S. Postretirement Health Care Plans
Defined Benefit Plan Disclosure [Line Items]
Prior unrecognized gains included in Accumulated OCI	$ 0.8
Health care cost trend rate, 2038	4.50%
Increase in accumulated postretirement benefit obligation	$ 0.5
Increase in service cost and interest cost components	0.1
Decrease in accumulated postretirement benefit obligation	0.6
Decrease in service cost and interest cost components	$ 0.1

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- Definition

Defined Benefit Plan, Post-Sixty-Five Health Care Cost Trend Rate Assumed, Next Fiscal Year

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Defined Benefit Plan, Pre-Sixty-Five Health Care Cost Trend Rate Assumed, Next Fiscal Year

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Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

+ References

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-Publisher FASB
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-Section 50
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Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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