Business combinations - Summary of Assumptions Used to Measure Accrued Pension Liabilities (Detail)	Feb. 27, 2015
Business Combinations [Abstract]
Discount rate	1.70%
Salary increase	3.00%
Pension increase	1.80%
Turnover	2.00%

Estimated rate of return used in the calculation of the defined pension benefit obligation.

No definition available.

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- Definition

Estimated rate of turnover used in the calculation of the defined pension benefit obligation.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ 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 (k)(1)

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ 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 (k)(2)

-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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