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Inventories - Additional Information (Detail) - USD ($) $ in Millions	Dec. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods inventory held by distributors	$ 3.7	$ 4.9

X

- Definition

Inventory finished goods held by distributors.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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