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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions | Jul. 28, 2015 | Jul. 27, 2015 | Apr. 30, 2013
--- | --- | --- | ---
Subsequent events |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 90
Subsequent event |  |  |
Subsequent events |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 100 |
Subsequent event | Class A |  |  |
Subsequent events |  |  |
Quarterly dividend declared (in dollars per share) | $ 0.17 |  |
Subsequent event | Class A | Maximum |  |  |
Subsequent events |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 100 |
Subsequent event | Class B |  |  |
Subsequent events |  |  |
Quarterly dividend declared (in dollars per share) | $ 0.17 |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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