Annual report pursuant to Section 13 and 15(d)

Capital Stock and Stock Restrictions (Details)

v2.4.1.9
Capital Stock and Stock Restrictions (Details)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Equity, Class of Treasury Stock [Line Items]        
Treasury Stock, Shares (17,466,855)us-gaap_TreasuryStockShares (17,130,965)us-gaap_TreasuryStockShares    
Class A Common Stock [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common Stock, Shares, Outstanding 45,852,740us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		44,970,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		50,429,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 415,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		808,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		158,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Treasury Stock, Shares, Acquired (336,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		(162,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		(5,788,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 907,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		237,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		171,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Common Stock, Shares, Outstanding 46,839,361us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		45,852,740us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		44,970,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		 
Class B Common Stock [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common Stock, Shares, Outstanding       13,937,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock, Shares, Outstanding 13,937,151us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		13,937,151us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		13,937,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember 		13,937,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Treasury Stock [Member]        
Equity, Class of Treasury Stock [Line Items]        
Treasury Stock, Shares (17,131,000)us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		(16,969,000)us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		(11,181,000)us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		 
Treasury Stock, Shares, Acquired (336,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		(162,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		(5,788,000)us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		 
Treasury Stock, Shares (17,467,000)us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		(17,131,000)us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember 		(16,969,000)us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember