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Accounts Receivable, Net and Significant Customers (Significant Customers) (Details)
 3 Months Ended
Mar. 27, 2015
Mar. 28, 2014
Dec. 31, 2014
Revenue, Major Customer [Line Items]      
Sales to distributors 73.00%altr_SalesToDistributorsasaPercentageofNetSales 74.00%altr_SalesToDistributorsasaPercentageofNetSales  
Sales to OEMs 27.00%altr_SalesToOemsAsPercentageOfNetSales 26.00%altr_SalesToOemsAsPercentageOfNetSales  
Concentration Risk, Percentage 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1  
Arrow Electronics, Inc      
Revenue, Major Customer [Line Items]      
Sales to distributors 41.00%altr_SalesToDistributorsasaPercentageofNetSales
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsOneArrowMember		 [1] 38.00%altr_SalesToDistributorsasaPercentageofNetSales
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsOneArrowMember		 [1]  
Accounts Receivable From Distributors As Percentage Of Total Accounts Receivables 30.00%altr_AccountsReceivableFromDistributorsAsPercentageOfTotalAccountsReceivables
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsOneArrowMember		   34.00%altr_AccountsReceivableFromDistributorsAsPercentageOfTotalAccountsReceivables
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsOneArrowMember
Macnica, Inc      
Revenue, Major Customer [Line Items]      
Sales to distributors 20.00%altr_SalesToDistributorsasaPercentageofNetSales
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsTwoMacnicaMember		 [1] 24.00%altr_SalesToDistributorsasaPercentageofNetSales
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsTwoMacnicaMember		 [1]  
Accounts Receivable From Distributors As Percentage Of Total Accounts Receivables 50.00%altr_AccountsReceivableFromDistributorsAsPercentageOfTotalAccountsReceivables
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsTwoMacnicaMember		   47.00%altr_AccountsReceivableFromDistributorsAsPercentageOfTotalAccountsReceivables
/ us-gaap_MajorCustomersAxis
= altr_SalesDistributorsTwoMacnicaMember
OEM One      
Revenue, Major Customer [Line Items]      
Sales to OEMs 12.00%altr_SalesToOemsAsPercentageOfNetSales
/ us-gaap_MajorCustomersAxis
= altr_SalesOEMsOneMember		 11.00%altr_SalesToOemsAsPercentageOfNetSales
/ us-gaap_MajorCustomersAxis
= altr_SalesOEMsOneMember		  
[1] Except as presented above, no other distributor accounted for greater than 10% of our net sales for the three months ended March 27, 2015 or March 28, 2014.