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Stock Repurchase Program - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Oct. 29, 2014	Apr. 04, 2015	Mar. 29, 2014	Feb. 28, 2013
Class of Stock [Line Items]
Number of common shares authorized to be repurchased under new stock repurchase program	9,000,000.0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased			6,000,000.0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Stock Repurchase Program, Number of Additional Shares Authorized in the Period	3,000,000masi_StockRepurchaseProgramNumberofAdditionalSharesAuthorizedinthePeriod
Stock repurchase program, number of shares repurchased		300,000.0us-gaap_TreasuryStockSharesAcquired	0us-gaap_TreasuryStockSharesAcquired
Stock repurchase program, average price per share		$ 32.89us-gaap_TreasuryStockAcquiredAverageCostPerShare
Stock repurchase program, total value		$ 8,200,000us-gaap_TreasuryStockValueAcquiredCostMethod
Accrued Stock Repurchases		$ 6,078,000masi_AccruedStockRepurchases

X

- Definition

Accrued Stock Repurchases

+ References

No definition available.

+ Details

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Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Stock Repurchase Program, Number of Additional Shares Authorized in the Period

+ References

No definition available.

+ Details

Name:	masi_StockRepurchaseProgramNumberofAdditionalSharesAuthorizedinthePeriod
Namespace Prefix:	masi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Balance Type:	debit
Period Type:	duration