Note 2 Summary of Significant Accounting Policies (Allowance for Ship and Debit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Allowance for Accounts Receivable Ship And Debit [Roll Forward]
Beninning Balance	$ 1,396	$ 1,101	$ 1,400
Additions	4,757	5,842	5,858
Deductions	(5,082)	(5,547)	(6,157)
Ending Balance	$ 1,071	$ 1,396	$ 1,101

Reduction to the estimated valuation allowance on account receivables arising from price adjustment in meeting the competitive price in the marketplace, within the normal operating cycle.

No definition available.

Name:	ixys_AllowanceForAccountsReceivableShipAndDebitDeductions
Namespace Prefix:	ixys_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration