Note 14 Segment and Geographic Information (Narratives) (Details)	3 Months Ended	9 Months Ended
Dec. 31, 2014 N	Dec. 31, 2014 N	Dec. 31, 2013 N
Segment Reporting [Abstract]
Top Customer Percentage More Than 10% of Total Revenue	10.30%	10.60%	11.40%
Second Customer Percentage More Than 10% of Total Revenue		10.00%	10.20%
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