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Subsequent Events (Details) - $ / shares shares in Millions | Oct. 27, 2016 | Feb. 28, 2015
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Common Class B [Member] |  |
Number of shares authorized under share repurchase program | 4 | 4
Subsequent Event [Member] |  |
Dividend declared | $ 1.25 |
Quarterly Dividend [Member] | Subsequent Event [Member] |  |
Dividend declared | 0.25 |
Special Dividend [Member] | Subsequent Event [Member] |  |
Dividend declared | $ 1.00 |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Balance Type: | na
Period Type: | instant

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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