Stock-Based Compensation (Details Textual) (USD $)	1 Months Ended	3 Months Ended			3 Months Ended					3 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	Jan. 31, 2012	Jul. 01, 2012 Equity_Plans	Jul. 03, 2011	Apr. 01, 2012	Jul. 01, 2012 2000 Non-Qualified Stock Option Plan [Member]	Jul. 01, 2012 2002 Non-Qualified Stock Option Plan [Member]	Jul. 01, 2012 ESPP [Member]	Jul. 01, 2012 RSUs [Member]	Jul. 01, 2012 Equity Incentive Plans [Member]	Jul. 01, 2012 Equity Incentive Plans [Member] Minimum [Member]	Jul. 01, 2012 Equity Incentive Plans [Member] Maximum [Member]	Jul. 31, 2009 Executives [Member] Performance-Based RSUs [Member]	Jul. 01, 2012 Executives [Member] Performance-Based RSUs [Member]	Jul. 03, 2011 Executives [Member] Performance-Based RSUs [Member]	Jan. 31, 2012 Chief Executive Officer [Member]	Jul. 01, 2012 Chief Executive Officer [Member]	Mar. 31, 2012 Chief Executive Officer [Member] Performance-Based RSUs [Member]	Jul. 01, 2012 Chief Executive Officer [Member] Performance-Based RSUs [Member]	Apr. 30, 2012 Chief Executive Officer [Member] Bonous RSUs [Member]	Jul. 01, 2012 Chief Executive Officer [Member] Bonous RSUs [Member]	Jul. 01, 2012 Chief Executive Officer [Member] Bonous RSUs [Member] First Installment [Member]	Jul. 01, 2012 Chief Executive Officer [Member] Bonous RSUs [Member] Second Installment [Member]	Jul. 01, 2012 Chief Executive Officer [Member] Bonous RSUs [Member] Third Installment [Member]
Stock Based Compensation (Additional Textual) [Abstract]
Employee's percentage of public purchase price of common stock							95.00%
The Sipex Corporation 2000, 2002 Non-Qualified Stock Option Plan expired					Oct. 31, 2010	Oct. 01, 2011
Estimated additional stock-based compensation expense in 2012										5,500,000
Shares of Common Stock, Authorized to issue							4,500,000				8,300,000
Shares available for future grant									5,000,000
Stock-based compensation expense		$ 174,000	$ 884,000										$ 0	$ 27,000		$ 65,000		$ 112,000
Compensation expense for awards																		$ 0		$ 94,000
Granted performance-based stock options															480,000
Granted, Shares								161,254				99,000					300,000		29,000
Performance based RSUs vesting period													3 years			4 years		3 years
Share based compensation vesting period																				The RSUs shall vest 25% on the date that is six months after the commencement of the fiscal year 2013; 25% on the last day our fiscal year 2013; and the remaining 50% when and if the Exar Board of Directors determines that certain targets under the Exar’s Fiscal Year 2013 Executive Management Incentive Program (“2013 Incentive Program”) have been met.
Share based compensation installments																					25.00%	25.00%	50.00%
Stock Based Compensation (Textual) [Abstract]
Closing price of common stock		$ 8.13		$ 8.40
Number of equity incentive plans		2
Forfeiture of options if financial measures are not met period	2 years