Fair Value Measurement on a Nonrecurring Basis (Details Textuals) (Level 3 [Member], JPY ¥) In Millions	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010
Level 3 [Member]
Fair Value Measurement on a Nonrecurring Basis (Textuals) [Abstract]
Impairment losses related to long lived assets	¥ 23,735	¥ 53,304
Carrying values of impaired long lived assets before impairments	27,513	58,598
Fair values of impaired long-lived assets after impairments	¥ 3,778	¥ 5,294

Name:

sne_CarryingValuesOfImpairedLongLivedAssetsBeforeImpairments

Namespace Prefix:

sne

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

instant