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Fair Value Measurements - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Transfers into level 1 ¥ 3,522 ¥ 2,833  
Transfers out of level 1 3,086 3,103  
Impairments   112,069  
All Other | Battery Business Asset Group      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of long-lived assets     ¥ 30,643
All Other | Battery Business Asset Group | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, discount rate     10.00%
All Other | Battery Business Asset Group | Minimum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate     0.00%
All Other | Battery Business Asset Group | Maximum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate     14.00%
Semiconductors | Camera Module Business Asset Group      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of long-lived assets   ¥ 23,860 ¥ 59,616
Semiconductors | Camera Module Business Asset Group | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, discount rate   10.00% 10.00%
Semiconductors | Camera Module Business Asset Group | Minimum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate   (1.00%) 0.00%
Semiconductors | Camera Module Business Asset Group | Maximum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate   8.00% 108.00%
Mobile Communications | Smartphone Business Asset Group      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of long-lived assets ¥ 31,341    
Mobile Communications | Smartphone Business Asset Group | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, discount rate 8.50%    
Mobile Communications | Smartphone Business Asset Group | Minimum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate (8.00%)    
Mobile Communications | Smartphone Business Asset Group | Maximum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate 6.00%    
Pictures      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairments   ¥ 112,069  
Pictures | Production and Distribution      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairments   ¥ 112,069  
Pictures | Production and Distribution | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, discount rate   9.50%  
Fair value measurements, earnings multiple   9  
Pictures | Production and Distribution | Minimum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate   3.00%  
Pictures | Production and Distribution | Maximum | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value measurements, projected revenue growth rate   4.50%