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Capital Stock and Stock Restrictions (Details)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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Mar. 31, 2013
Class A Common Stock [Member]
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Mar. 31, 2012
Class A Common Stock [Member]
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Mar. 31, 2011
Class A Common Stock [Member]
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Mar. 31, 2010
Class A Common Stock [Member]
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Mar. 31, 2012
Class B Common Stock [Member]
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Mar. 31, 2011
Class B Common Stock [Member]
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Mar. 31, 2013
Class B Common Stock [Member]
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Mar. 31, 2010
Class B Common Stock [Member]
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Mar. 31, 2013
Treasury Stock [Member]
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Mar. 31, 2012
Treasury Stock [Member]
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Mar. 31, 2011
Treasury Stock [Member]
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Mar. 31, 2010
Treasury Stock [Member]
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May 31, 2011
February 2010 authorization [Member]
Class A Common Stock [Member]
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Mar. 31, 2011
February 2010 authorization [Member]
Class A Common Stock [Member]
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May 31, 2011
February 2010 authorization [Member]
Class B Common Stock [Member]
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Mar. 31, 2013
August 2011 authorization [Member]
Class A Common Stock [Member]
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Mar. 31, 2012
August 2011 authorization [Member]
Class A Common Stock [Member]
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Mar. 31, 2013
Voting trust and other trusts [Member]
Class B Common Stock [Member]
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| Equity, Class of Treasury Stock [Line Items] | ||||||||||||||||||||
| Common Stock, Shares, Outstanding | 44,969,841 | 50,429,399 | 54,174,000 | 52,762,000 | 13,937,151 | 14,556,000 | 13,937,151 | 14,694,000 | 13,937,150 | |||||||||||
| Treasury Stock, Shares | (16,969,296) | (11,180,931) | (16,969,000) | (11,181,000) | (4,629,000) | (4,273,000) | ||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | (158,000) | (912,000) | (1,540,000) | |||||||||||||||||
| Conversion of Stock, Shares Converted | (619,000) | (138,000) | 619,000 | 138,000 | (618,664) | |||||||||||||||
| Treasury Stock, Shares, Acquired | (5,788,000) | (6,552,000) | (356,000) | (5,788,000) | (6,552,000) | (356,000) | (1,000,000) | (356,064) | (5,700,000) | (6,400,000) | ||||||||||
| Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | (171,000) | (1,276,000) | (90,000) | |||||||||||||||||