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Note 12 - Stock-based Compensation (Details) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 28, 2014
Dec. 29, 2013
Jan. 31, 2014
Jan. 31, 2012
Mar. 31, 2012
Jun. 30, 2013
Sep. 28, 2014
Jan. 31, 2015
Dec. 31, 2013
Dec. 28, 2014
Oct. 31, 2013
Oct. 31, 2014
Mar. 30, 2014
Jun. 30, 2014
Sep. 18, 2014
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 8,042,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   8,042,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber                 8,042,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber     7,213,848us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized   4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized                 4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized          
Share Price (in Dollars per share) $ 10.29us-gaap_SharePrice   $ 10.29us-gaap_SharePrice                 $ 10.29us-gaap_SharePrice     $ 11.71us-gaap_SharePrice    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)     2,517,178us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross                            
Allocated Share-based Compensation Expense $ 4,222,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,557,000us-gaap_AllocatedShareBasedCompensationExpense $ 10,949,000us-gaap_AllocatedShareBasedCompensationExpense $ 7,267,000us-gaap_AllocatedShareBasedCompensationExpense                          
Employee Stock Option [Member] | Chief Executive Officer [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)         140,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 480,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		                      
Share Based Compensation Arrangement By Share Based Payment Award, Vesting, Number of Installments           4exar_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfInstallments
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		                      
Allocated Share-based Compensation Expense 75,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 65,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 262,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 195,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		                          
Performance-Based RSUs [Member] | Chief Executive Officer [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share Based Compensation Arrangement By Share Based Payment Award, Vesting, Number of Installments             3exar_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfInstallments
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		                    
Allocated Share-based Compensation Expense 146,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 119,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 1,026,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		 641,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)             300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years                    
Performance-Based RSUs [Member] | Certain Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share Based Compensation Arrangement By Share Based Payment Award, Vesting, Number of Installments               3exar_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfInstallments
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		                  
Allocated Share-based Compensation Expense (53,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		 91,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		 (151,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		 239,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)               50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		                  
Performance-Based RSUs [Member] | Former Stretch Employees [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share Based Compensation Arrangement By Share Based Payment Award, Vesting, Number of Installments         3exar_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfInstallments
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_FormerStretchEmployeesMember		                        
Allocated Share-based Compensation Expense (47,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_FormerStretchEmployeesMember		   (122,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_FormerStretchEmployeesMember		                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)         82,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_FormerStretchEmployeesMember		                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years                        
Performance-Based RSUs [Member] | 2014 Incentive Program [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Allocated Share-based Compensation Expense     (290,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_PlanNameAxis
= exar_IncentiveProgramMember		           (295,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_PerformanceBasedRSUsMember
/ us-gaap_PlanNameAxis
= exar_IncentiveProgramMember		                
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | Two Terminated Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)                   60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= exar_TwoTerminatedExecutivesMember		              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                   12 months              
Restricted Stock Units (RSUs) [Member] | Subsequent Event [Member] | One of Two Terminated Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Stock Granted, Value, Share-based Compensation, Gross                   479,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= exar_OneofTwoTerminatedExecutivesMember		              
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)                     100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		            
Restricted Stock Units (RSUs) [Member] | Cadeka Employees [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Allocated Share-based Compensation Expense 506,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= exar_CadekaEmployeesMember		   1,519,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= exar_CadekaEmployeesMember		                            
Restricted Stock Units (RSUs) [Member] | Two Terminated Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Allocated Share-based Compensation Expense 1,519,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= exar_TwoTerminatedExecutivesMember		                     1,519,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= exar_TwoTerminatedExecutivesMember		          
Restricted Stock Units (RSUs) [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)     337,022us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		                            
October 2013 PRSUs [Member] | Certain Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Allocated Share-based Compensation Expense (78,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_OctoberTwoThousandThirteenPRSUsMember
/ us-gaap_StatementScenarioAxis
= exar_CertainExecutivesMember		                                
October 2013 PRSUs [Member] | Certain Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share Based Compensation Arrangement By Share Based Payment Award, Vesting, Number of Installments                         3exar_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfInstallments
/ us-gaap_AwardTypeAxis
= exar_OctoberTwoThousandThirteenPRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		        
Allocated Share-based Compensation Expense     (208,000)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= exar_OctoberTwoThousandThirteenPRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)                         70,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= exar_OctoberTwoThousandThirteenPRSUsMember
/ us-gaap_TitleOfIndividualAxis
= exar_CertainExecutivesMember		        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                         3 years        
Subsequent Event [Member] | Two Terminated Executives [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Sharebased Compensation Arrangement by Share Based Payment Award Additional Vesing Period For Outstanding Stock Awards                   13 months              
Sharebased Compensation Arrangement by Share Based Payment Award Additional Exercise Period For Vested Stock Awards                   25 months              
Chief Executive Officer [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Number of RSUs Modified Into PRSUs (in Shares)                           50,000exar_NumberOfRSUsModifiedIntoPRSUs
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		      
Employee Stock Participation Plan [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent     95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= exar_EmployeeStockParticipationPlanMember		                            
2006 Plan and Sipex 2006 Plan [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)                               6,555,492us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= exar_The2006PlanAndSipex2006PlanMember		  
2006 Plan [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)                               669,008us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= exar_TwoThousandSixPlanMember		  
2014 Plan [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)                                 5,170,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= exar_The2014PlanMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 4,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= exar_The2014PlanMember		   4,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= exar_The2014PlanMember		                 4,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= exar_The2014PlanMember		          
2015 Incentive Program [Member]                                  
Note 12 - Stock-based Compensation (Details) [Line Items]                                  
Allocated Share-based Compensation Expense $ 679,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= exar_The2015IncentiveProgramMember		   $ 1,256,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= exar_The2015IncentiveProgramMember