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Leased Assets - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Leases Disclosure [Line Items]
Rental expenses under operating leases	¥ 76,188	¥ 78,538	¥ 87,077
Sublease rental received under operating leases	1,423	1,974	1,675
Total minimum rentals received in future under non cancelable subleases for operating lease	4,527
Sony Semiconductor Kyushu Corporation
Leases Disclosure [Line Items]
Proceeds from sale and leaseback transactions	¥ 50,537
Sale and leaseback transaction	3 years

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller less the costs incurred in connection with the transaction, such as closing and deferred financing costs.

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