Note 9 Restructuring Charges (Narratives) (Details)	3 Months Ended
Jun. 30, 2012
Restructuring Charges [Abstract]
Restructuring and Related Costs Payment Date	Dec. 31, 2013

Date on which the costs in connection with the restructuring and related activities are expected to be paid off.

No definition available.

Name:	ixys_RestructuringAndRelatedCostsPaymentDate
Namespace Prefix:	ixys_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration