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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Mar. 29, 2014
Dec. 28, 2013
Accrued customer rebates, fees and reimbursement $ 17,720masi_Accruedcustomerrebatesfeesandreimbursement $ 11,645masi_Accruedcustomerrebatesfeesandreimbursement    
Accrued Stock Repurchase 6,078masi_AccruedStockRepurchase 0masi_AccruedStockRepurchase    
Accrued Income Taxes 2,991us-gaap_AccruedIncomeTaxes 4,372us-gaap_AccruedIncomeTaxes    
Income taxes payable 6,988us-gaap_AccruedIncomeTaxesCurrent 6,562us-gaap_AccruedIncomeTaxesCurrent    
Product Warranty Accrual 1,480us-gaap_ProductWarrantyAccrual 1,416us-gaap_ProductWarrantyAccrual 1,121us-gaap_ProductWarrantyAccrual 1,161us-gaap_ProductWarrantyAccrual
Other Accrued Liabilities, Current 9,346us-gaap_OtherAccruedLiabilitiesCurrent 7,108us-gaap_OtherAccruedLiabilitiesCurrent    
Accrued liabilities $ 37,615us-gaap_AccruedLiabilitiesCurrent $ 24,541us-gaap_AccruedLiabilitiesCurrent