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Summary of Significant Accounting Policies - Additional Information (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Apr. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Summary Of Significant Accounting Policies [Line Items]        
Description of evaluating factors in relation to available for sale securities   If the fair value of the security is 20 percent or more below its original cost for an extended period of time (generally for a period of up to six months)    
Percentage of other-than-temporary fair value of security   20.00%    
Consideration given to a reseller, primarily for free promotional shipping and cooperative advertising programs included in selling, general and administrative expenses   ¥ 12,319 ¥ 12,046 ¥ 13,178
Subsequent event | Accounting Standards Update 2016-01 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Reclassification of accumulated other comprehensive income classified as available-for-sale to retained earnings ¥ 0      
Home Entertainment & Sound | Error in the amount of accruals for certain sales incentives being recorded at a subsidiary        
Summary Of Significant Accounting Policies [Line Items]        
Out of period adjustment to correct error       ¥ 8,447
Software to be sold, leased or otherwise marketed        
Summary Of Significant Accounting Policies [Line Items]        
Amortization period of intangible assets   3 years    
Minimum | Buildings        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives for depreciation   2 years    
Minimum | Machinery, equipment and others        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives for depreciation   2 years    
Minimum | Patent rights; know-how; license agreements; trademarks; software to be sold, leased or otherwise marketed, and internal-use software        
Summary Of Significant Accounting Policies [Line Items]        
Amortization period of intangible assets   3 years    
Minimum | Customer relationships, music catalogs, artist contracts and television carriage contracts (broadcasting agreements)        
Summary Of Significant Accounting Policies [Line Items]        
Amortization period of intangible assets   10 years    
Maximum | Buildings        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives for depreciation   50 years    
Maximum | Machinery, equipment and others        
Summary Of Significant Accounting Policies [Line Items]        
Useful lives for depreciation   10 years    
Maximum | Patent rights; know-how; license agreements; trademarks; software to be sold, leased or otherwise marketed, and internal-use software        
Summary Of Significant Accounting Policies [Line Items]        
Amortization period of intangible assets   10 years    
Maximum | Customer relationships, music catalogs, artist contracts and television carriage contracts (broadcasting agreements)        
Summary Of Significant Accounting Policies [Line Items]        
Amortization period of intangible assets   40 years