Fair value measurement (Details) (USD $) In Thousands, unless otherwise specified									6 Months Ended
Jun. 29, 2014	Dec. 29, 2013	Jun. 29, 2014 Level 1 [Member]	Dec. 29, 2013 Level 1 [Member]	Jun. 29, 2014 Level 2 [Member]	Dec. 29, 2013 Level 2 [Member]	Jun. 29, 2014 Level 3 [Member]	Dec. 29, 2013 Level 3 [Member]	Jun. 29, 2014 Minimum [Member] Level 3 [Member]	Jun. 29, 2014 Maximum [Member] Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Inputs, Discount Rate									10.00%	30.00%
assets and liabilities measured at fair value
Employee compensation related investments	$ 30,950	$ 28,117	$ 30,950	$ 28,117	$ 0	$ 0	$ 0	$ 0
Sundry investments	36,024	34,227	36,024	34,227	0	0	0	0
Total assets	66,974	62,344	66,974	62,344	0	0	0	0
Contingent consideration payable	15,882	32,267	0	0	0	0	15,882	32,267
Total liabilities	$ 15,882	$ 32,267	$ 0	$ 0	$ 0	$ 0	$ 15,882	$ 32,267

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Contingent Consideration Payable, Fair Value Disclosure

+ References

No definition available.

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- Definition

Deferred Compensation Plan Assets, Fair Value Disclosure

+ References

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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