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Investments in Affiliated Companies (Summarized Combined Financial Information Provided by Equity Investees) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Jan. 29, 2020
Dec. 31, 2019
Dec. 19, 2019
Schedule of Equity Method Investments [Line Items]            
Current assets ¥ 389,195 ¥ 355,320        
Noncurrent assets 164,852 608,626        
Current liabilities 194,219 188,905        
Noncurrent liabilities and noncontrolling interests 60,469 584,714        
Percentage of ownership in equity investees       50.00% 44.50% 56.30%
Net revenues 387,678 390,457 ¥ 468,933      
Operating income 58,431 53,920 56,729      
Net income attributable to controlling interests ¥ 34,916 ¥ 5,539 ¥ 27,301      
Minimum            
Schedule of Equity Method Investments [Line Items]            
Percentage of ownership in equity investees 20.00% 20.00% 20.00%      
Maximum            
Schedule of Equity Method Investments [Line Items]            
Percentage of ownership in equity investees 50.00% 50.00% 50.00%