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Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Royalty Receivable	$ 7,000masi_RoyaltyReceivable	$ 7,200masi_RoyaltyReceivable
Other Assets, Miscellaneous, Current	6,986us-gaap_OtherAssetsMiscellaneousCurrent	4,070us-gaap_OtherAssetsMiscellaneousCurrent
Prepaid Expense, Current	9,197us-gaap_PrepaidExpenseCurrent	9,816us-gaap_PrepaidExpenseCurrent
Due from Employees, Current	377us-gaap_DueFromEmployeesCurrent	385us-gaap_DueFromEmployeesCurrent
Other current assets	$ 23,560us-gaap_OtherAssetsCurrent	$ 21,471us-gaap_OtherAssetsCurrent

X

- Definition

Amount due from third party for royalty earned during the period resulting from a settlement agreement.

+ References

No definition available.

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- Definition

Amounts due from an Entity employee, not to include stockholders or officers, which are usually due within 1 year (or 1 business cycle).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a

-Article 5



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-Number 210

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

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- Definition

Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Amount of other miscellaneous assets expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Assets

-URI http://asc.fasb.org/extlink&oid=6509628



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section 45

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 05

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=47804770&loc=d3e5879-108316

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