Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details)

v3.7.0.1
Capital Stock and Stock Restrictions (Details) - shares
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity, Class of Treasury Stock [Line Items]    
Treasury Stock, Shares Start (17,560,758)  
Treasury Stock, Shares End (17,762,401) (17,560,758)
Class A Common Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Common Stock, Shares, Outstanding Start 47,184,725 46,839,000
Treasury Stock, Shares, Acquired (201,000) (94,000)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 1,076,000 440,000
Common Stock, Shares, Outstanding End 48,060,172 47,184,725
Class B Common Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Common Stock, Shares, Outstanding Start 13,937,151 13,937,000
Common Stock, Shares, Outstanding End 13,937,151 13,937,151
Treasury Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Treasury Stock, Shares Start (17,561,000) (17,467,000)
Treasury Stock, Shares, Acquired (201,000) (94,000)
Treasury Stock, Shares End (17,762,000) (17,561,000)