Fair Value Measurements and Disclosures - Textual (Details) (Fair Value, Measurements, Recurring [Member], Zygo Corporation [Member], USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Fair Value, Measurements, Recurring [Member] \| Zygo Corporation [Member]
Fair Value Measurements and Disclosures (Textual) [Abstract]
Liabilities resulting from the acquisition of certain assets from acquisitions, measured at fair value	$ 2.4	$ 2.8
Current liability at fair value	1.4	1.3
Long-term liability at fair value	$ 1.0	$ 1.5

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

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- Definition

Amount of liabilities assumed at the acquisition date.

+ References

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- Definition

Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

+ Details

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