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Stockholders' Equity - Additional Information (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Nov. 18, 2019
JPY (¥)
Nov. 18, 2019
USD ($)
Mar. 31, 2020
JPY (¥)
shares
Mar. 31, 2019
JPY (¥)
shares
Mar. 31, 2019
USD ($)
shares
Mar. 26, 2020
shares
Stockholders Equity Note [Line Items]            
Common stock shares would be issued upon conversion or exercise of all convertible bonds and stock acquisition rights outstanding | shares     36,802,040      
Number of shares repurchased | shares     33,059,200 19,309,100 19,309,100  
Stock repurchase amount | ¥     ¥ 199,999 ¥ 100,000    
Retained earnings available for dividends to shareholders | ¥     683,084      
Undistributed earnings of affiliated companies accounted for by equity method | ¥     ¥ 61,226 ¥ 46,477    
Treasury Stock [Member]            
Stockholders Equity Note [Line Items]            
Number of treasury stocks retired during the period | shares           12,737,400
Nile Acquisition LLC            
Stockholders Equity Note [Line Items]            
Percentage of equity ownership       25.10%    
Businesses acquisition payment of cash consideration | $         $ 287.5  
Decrease to additional paid-in capital resulting from difference between cash consideration paid and decrease in noncontrolling interests | $         $ 295.9  
Game Show Network, LLC [Member]            
Stockholders Equity Note [Line Items]            
Percentage of equity ownership 42.00% 42.00%        
Businesses acquisition payment of cash consideration ¥ 53,992 $ 496.0        
Dividends distributed | $   $ 129.0