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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Variable Interest Entities - Additional Information (Detail) ¥ in Millions	Mar. 31, 2018 JPY (¥)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 JPY (¥)
Variable Interest Entity [Line Items]
Net investment related to VIE \| ¥	¥ 157,389		¥ 149,371
Joint ventures with companies involved in production and creation of recorded music
Variable Interest Entity [Line Items]
Variable interest entity primary beneficiary, aggregate total assets \| ¥	37,540
Variable interest entity primary beneficiary, aggregate total liabilities \| ¥	¥ 24,625
DH Publishing, L.P. \| Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Net investment related to VIE		$ 213,000,000
Net payable related to VIE		3,000,000
Amount of maximum exposure to losses		210,000,000
Subsidiary in Pictures Segment \| Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Amount of maximum exposure to losses		$ 26,000,000