Treasury Stock (Details) (Common Stock Class A, USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended
Aug. 21, 2014	Nov. 01, 2014
Common Stock Class A
Class of Stock [Line Items]
Shares paid to satisfy employee withholding tax obligations		111,928
Payments related to tax withholding for share-based compensation		$ 0.1
Forfeitures of stock-based compensation (in shares)		434,983
Retirement of treasury stock, shares	351,692

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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- Definition

Number of shares (or other type of equity) forfeited during the period.

+ References

No definition available.

+ Details

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- Definition

Number of shares of common and preferred stock retired from treasury during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

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