Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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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No definition available.

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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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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligation (Detail) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2017	Jul. 02, 2017	Dec. 31, 2016	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure
Actuarial loss	$ (3,800)	$ (2,500)	$ (2,000)	$ 700	$ (700)	$ (1,200)
Ending Balance	325,800						$ 325,800
United States Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year						351,117	353,616	$ 351,117
Service cost							2,239	2,302	$ 2,462
Interest cost							13,151	13,630	13,142
Actuarial loss							12,702	6,053
Benefits paid							(18,682)	(19,486)
Projected benefit obligation, End of year	363,026		353,616				363,026	353,616	351,117
Beginning Balance						298,404	307,304	298,404
Company contributions							4,462	4,489
Actual return on plan assets							31,422	23,897
Benefits paid							(18,682)	(19,486)
Ending Balance	324,506		307,304				324,506	307,304	298,404
Funded status	(38,520)		(46,312)				(38,520)	(46,312)
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year						62,290	60,738	62,290
Service cost							818	761	1,006
Interest cost							852	1,185	1,444
Actuarial loss							262	5,621
Benefits paid							(994)	(1,385)
Settlements							(28,560)
Expenses paid							(40)	(609)
Non-U.S. currency movement							6,277	(7,125)
Projected benefit obligation, End of year	39,353		60,738				39,353	60,738	62,290
Beginning Balance						28,141	27,571	28,141
Company contributions							883	867
Actual return on plan assets							737	5,142
Benefits paid							(994)	(1,148)
Settlements							(28,560)
Expenses paid							(40)	(609)
Non-U.S. currency movement							1,710	(4,822)
Ending Balance	1,307		27,571				1,307	27,571	28,141
Funded status	(38,046)		(33,167)				(38,046)	(33,167)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure
Projected benefit obligation, Beginning of year						$ 6,030	5,510	6,030
Service cost							34	37	48
Interest cost							201	218	237
Actuarial loss							398	5
Special termination benefits							591
Benefits paid							(557)	(687)
Plan amendments								(93)
Projected benefit obligation, End of year	6,177		5,510				6,177	5,510	$ 6,030
Company contributions							557	687
Benefits paid							(557)	(687)
Funded status	$ (6,177)		$ (5,510)				$ (6,177)	$ (5,510)