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Royalties Receivable - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 04, 2015	Jan. 03, 2015
Royalties Receivable [Abstract]
Royalty receivable	$ 7,000masi_RoyaltyReceivable	$ 7,200masi_RoyaltyReceivable

X

- Details

Name:	masi_RoyaltiesReceivableAbstract
Namespace Prefix:	masi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	masi_RoyaltyReceivable
Namespace Prefix:	masi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant