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Employee Savings and Retirement Plan	12 Months Ended
Mar. 31, 2012
Postemployment Benefits [Abstract]
Postemployment Benefits Disclosure [Text Block]	14. Employee Savings and Retirement Plan We have a 401(k) plan, known as the “IXYS Corporation and Subsidiary Employee Savings and Retirement Plan.” Eligibility to participate in the plan is subject to certain minimum service requirements. Employees may voluntarily contribute up to the limit prescribed by law and we may make matching contributions in our discretion. Employees are 100% vested immediately in any contributions by us. For the years ended March 31, 2012, 2011 and 2010, we contributed $571,000, $590,000 and $487,000, respectively. IXYS UK also started a defined contribution plan in fiscal 2007 known as “Westcode Semiconductor Group Personal Pension.” The plan is subject to minimum service requirements. Employees contribute from 2.5% to 4.5% of the pensionable salary. IXYS UK contributes between 5% to 7% depending upon the contribution by the employee. Additionally, IXYS UK pays the annual management charges for the plan. Employees are 100% vested immediately in any contributions by IXYS UK. For the years ended March 31, 2012, 2011 and 2010, IXYS UK contributed $344,000, $337,000 and $312,000, respectively.

Employee Savings and Retirement Plan

12 Months Ended

Mar. 31, 2012

Postemployment Benefits Disclosure [Text Block]

14. Employee Savings and Retirement Plan

We have a 401(k) plan, known as the “IXYS Corporation and Subsidiary Employee Savings and Retirement Plan.” Eligibility to participate in the plan is subject to certain minimum service requirements. Employees may voluntarily contribute up to the limit prescribed by law and we may make matching contributions in our discretion. Employees are 100% vested immediately in any contributions by us. For the years ended March 31, 2012, 2011 and 2010, we contributed $571,000, $590,000 and $487,000, respectively.

IXYS UK also started a defined contribution plan in fiscal 2007 known as “Westcode Semiconductor Group Personal Pension.” The plan is subject to minimum service requirements. Employees contribute from 2.5% to 4.5% of the pensionable salary. IXYS UK contributes between 5% to 7% depending upon the contribution by the employee. Additionally, IXYS UK pays the annual management charges for the plan. Employees are 100% vested immediately in any contributions by IXYS UK. For the years ended March 31, 2012, 2011 and 2010, IXYS UK contributed $344,000, $337,000 and $312,000, respectively.

- Definition

The entire disclosure for postemployment benefits, which may include supplemental unemployment benefits, obligations recognized for all types of benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement. Disclosure may also include discussion that an obligation for postemployment benefits is not accrued in accordance with regulation only because the amount cannot be reasonably estimated.

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