Note 15 Segment and Geographic Information (Narratives) (Details)	12 Months Ended
Mar. 31, 2014 N	Mar. 31, 2013 N	Mar. 31, 2012 N
Segment Reporting [Abstract]
Top Customer Percentage More than 10% of Total Revenue	10.80%	10.30%	11.30%
Second Customer Percentage More than 10% of Total Revenue		13.20%	11.10%
Number of Major Customers	1	2	2

Percentage of revenue generated from the second ranked external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	ixys_EntityWideRevenueSecondCustomerPercentage
Namespace Prefix:	ixys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration