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Pension and other postretirement benefits (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 26, 2016	Jun. 26, 2016
Compensation and Retirement Disclosure [Abstract]
Expected employer contribution for current year		$ 2.4
Employer contribution to pension plan	$ 1.7

X

- References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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X

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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