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Divestitures - Additional Information (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Apr. 01, 2017
USD ($)
Apr. 01, 2015
JPY (¥)
Mar. 31, 2018
JPY (¥)
Mar. 31, 2017
JPY (¥)
Battery Business Asset Group | Discontinued Operations, Held-for-sale | Other Operating Expense, Net        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment losses recorded as a result of fair value valuation of assets and liabilities       ¥ 42,298
Part of Logistics Business | Disposal Group, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration for sale of subsidiaries   ¥ 19,211    
Gain on sale of business   ¥ 12,284    
Sony Electronics Huanan Co., Ltd [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration for sale of subsidiaries | $ $ 234      
Sales price of business | $ $ 95      
Gain (loss) on sale of investments     ¥ 28,262