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Acquisitions - Additional Information (Detail)
¥ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jan. 29, 2020
JPY (¥)
Dec. 09, 2019
JPY (¥)
Dec. 09, 2019
USD ($)
Nov. 15, 2019
JPY (¥)
Nov. 15, 2019
USD ($)
Nov. 14, 2018
JPY (¥)
Nov. 14, 2018
USD ($)
Mar. 31, 2019
JPY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
JPY (¥)
Mar. 31, 2019
JPY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
JPY (¥)
Dec. 31, 2019
Dec. 19, 2019
Dec. 09, 2019
USD ($)
Nov. 15, 2019
USD ($)
Nov. 14, 2018
USD ($)
Business Acquisition [Line Items]                                    
Goodwill               ¥ 768,552   ¥ 783,888 ¥ 768,552   ¥ 530,492          
Revenue                   8,259,885 8,665,687   8,543,982          
Operating income                   845,459 894,235   734,860          
Percentage of equity interest 50.00%                         44.50% 56.30%      
Other acquisitions                                    
Business Acquisition [Line Items]                                    
Business acquisition total consideration                   6,853 7,743   27,459          
Goodwill               5,773   6,778 5,773   20,013          
Intangible assets acquired               4,422   ¥ 2,301 4,422   ¥ 4,980          
EMI Music Publishing                                    
Business Acquisition [Line Items]                                    
Cash consideration for acquisition           ¥ 257,168 $ 2,269                      
Step acquisition, percentage of equity interest acquired           60.00%                       60.00%
Revenue               18,420 $ 167   28,871 $ 260            
Operating income               ¥ 4,522 $ 41   6,432 58            
Step acquisition, percentage of equity ownership immediately before additional acquisition           40.00%                       40.00%
Equity interest owned prior to acquisition at fair value                     141,141 1,245            
Recognized gain on remeasured equity interest                     ¥ 116,939 $ 1,032            
Interest bearing debt amount           ¥ 148,621                       $ 1,311
Debt repayment           ¥ 108,942 $ 961                      
Weighted average amortization period                     43 years 43 years            
Insomniac Games, Inc                                    
Business Acquisition [Line Items]                                    
Business acquisition total consideration       ¥ 24,895 $ 229                          
Goodwill       17,945                         $ 164  
Intangible assets acquired       ¥ 6,794                         $ 62  
Silvergate Media Group                                    
Business Acquisition [Line Items]                                    
Cash consideration for acquisition   ¥ 21,017 $ 192                              
Goodwill   11,431                           $ 106    
Intangible assets acquired   ¥ 3,387                           $ 32    
Silvergate Topco Limited                                    
Business Acquisition [Line Items]                                    
Step acquisition, percentage of equity interest acquired   100.00%                           100.00%    
Silvergate BP Bidco Limited                                    
Business Acquisition [Line Items]                                    
Step acquisition, percentage of equity interest acquired   31.00%                           31.00%    
Acquisition of equity interests in joint ventures in the life insurance business                                    
Business Acquisition [Line Items]                                    
Cash consideration for acquisition ¥ 18,750                                  
Step acquisition, percentage of equity interest acquired 50.00%                                  
Equity interest owned prior to acquisition at fair value ¥ 13,932                                  
Recognized gain on remeasured equity interest ¥ 1,827                                  
Percentage of equity interest 100.00%