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Subsequent Events (Details) - $ / shares shares in Millions	Oct. 27, 2016	Feb. 28, 2015
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

X

- 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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Period Type:	instant

X

- 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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X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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X

- Details

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