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Divestitures - Additional Information (Detail)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 28, 2012
JPY (¥)
Jan. 31, 2014
USD ($)
Mar. 31, 2015
JPY (¥)
Mar. 31, 2014
JPY (¥)
Mar. 31, 2013
JPY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash proceeds from sale of business     ¥ 93 ¥ 15,016 ¥ 52,756
Restructuring costs     90,689 75,570 74,386
Other associated costs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Restructuring costs     20,259 14,759 ¥ 6,473
Chemical products business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash proceeds from sale of business ¥ 52,756        
Gain (loss) on sale of investments ¥ 9,050        
Gracenote          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Cash proceeds from sale of business | $   $ 156      
Gain (loss) on sale of investments | $   54      
Proceeds from sale of investments | $   $ 170      
PC business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment loss recorded in long-lived assets       12,817  
Restructuring costs     19,635 40,850  
Write-down of excess components in inventory and other       17,391  
PC business | Expenses to compensate suppliers          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Restructuring costs       8,019  
PC business | Employee termination benefits and other          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Restructuring costs       7,278  
PC business | Other associated costs          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Restructuring costs     ¥ 8,278 ¥ 12,819