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Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Goodwill [Line Items]    
Goodwill - gross ¥ 837,533 ¥ 813,353
Accumulated impairments (314,995) (207,063)
Goodwill 522,538 606,290
Increase (decrease) due to:    
Acquisitions 21,773 37,113 [1]
Sales and dispositions (121) (60)
Impairments   (112,069)
Translation adjustments (12,382) (4,578)
Other (1,316) (4,158)
Goodwill - gross 839,030 837,533
Accumulated impairments (308,538) (314,995)
Goodwill 530,492 522,538
Game & Network Services    
Goodwill [Line Items]    
Goodwill - gross 151,938 152,293
Goodwill 151,938 152,293
Increase (decrease) due to:    
Translation adjustments (1,332) (355)
Goodwill - gross 150,606 151,938
Goodwill 150,606 151,938
Music    
Goodwill [Line Items]    
Goodwill - gross 166,416 162,078
Accumulated impairments (306) (306)
Goodwill 166,110 161,772
Increase (decrease) due to:    
Acquisitions 2,877 7,689 [1]
Sales and dispositions (121)  
Translation adjustments (3,472) (3,351)
Goodwill - gross 165,700 166,416
Accumulated impairments (306) (306)
Goodwill 165,394 166,110
Pictures    
Goodwill [Line Items]    
Goodwill - gross 246,085 221,517
Accumulated impairments (107,932)  
Goodwill 138,153 221,517
Increase (decrease) due to:    
Acquisitions 12,842 29,363 [1]
Sales and dispositions   (60)
Impairments   (112,069)
Translation adjustments (6,583) (598)
Goodwill - gross 246,620 246,085
Accumulated impairments (102,208) (107,932)
Goodwill 144,412 138,153
Home Entertainment & Sound    
Goodwill [Line Items]    
Goodwill - gross 5,320 5,320
Accumulated impairments (5,320) (5,320)
Increase (decrease) due to:    
Goodwill - gross 5,320 5,320
Accumulated impairments (5,320) (5,320)
Imaging Products & Solutions    
Goodwill [Line Items]    
Goodwill - gross 8,451 8,637
Accumulated impairments (300) (300)
Goodwill 8,151 8,337
Increase (decrease) due to:    
Acquisitions 1,204  
Translation adjustments 162 (186)
Goodwill - gross 9,817 8,451
Accumulated impairments (300) (300)
Goodwill 9,517 8,151
Mobile Communications    
Goodwill [Line Items]    
Goodwill - gross 179,331 179,331
Accumulated impairments (176,045) (176,045)
Goodwill 3,286 3,286
Increase (decrease) due to:    
Goodwill - gross 179,331 179,331
Accumulated impairments (176,045) (176,045)
Goodwill 3,286 3,286
Semiconductors    
Goodwill [Line Items]    
Goodwill - gross 48,069 49,621
Goodwill 48,069 49,621
Increase (decrease) due to:    
Translation adjustments (1,072) (77)
Other (1,204) (1,475)
Goodwill - gross 45,793 48,069
Goodwill 45,793 48,069
Financial Services    
Goodwill [Line Items]    
Goodwill - gross 3,081 3,020
Accumulated impairments (706) (706)
Goodwill 2,375 2,314
Increase (decrease) due to:    
Acquisitions 4,850 61 [1]
Goodwill - gross 7,931 3,081
Accumulated impairments (706) (706)
Goodwill 7,225 2,375
All Other    
Goodwill [Line Items]    
Goodwill - gross 28,842 31,536
Accumulated impairments (24,386) (24,386)
Goodwill 4,456 7,150
Increase (decrease) due to:    
Translation adjustments (85) (11)
Other (112) (2,683)
Goodwill - gross 27,912 28,842
Accumulated impairments (23,653) (24,386)
Goodwill ¥ 4,259 ¥ 4,456
[1] Acquisitions for the fiscal year ended March 31, 2017 relate mainly to the TEN Sports Network acquisition in the Pictures segment. Refer to Note 24.