Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	Jun. 29, 2014
OII Site [Member]
Site Contingency [Line Items]
Settlement offer received and not accepted	$ 9.3
Omega Site [Member]
Site Contingency [Line Items]
Approximate number of defendants in litigation matter	100

The amount of settlement offer received from the U.S. Department of Justice and not accepted by Rachelle Laboratories, Inc., a subsidiary of the Entity.

No definition available.

Name:	irf_SettlementOfferReceivedAndNotAccepted
Namespace Prefix:	irf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant