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Common Stock and Stockholders' Equity (Deficit) (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015
Class Of Stock [Line Items] |  |
Common Stock, shares authorized |  | 1,300,000,000
Common Stock, par value |  | $ 0.0001
Preferred stock, shares authorized | 100,000,000 | 100,000,000
Common Stock, conversion features | Established that shares of our Class B common stock are voluntarily convertible into shares of our Class A common stock at the option of the holder and generally automatically convertible into shares of our Class A common stock upon transfer. |
Treasury Stock, shares | 3,052,953 | 3,052,953
Class A Common Stock |  |
Class Of Stock [Line Items] |  |
Common Stock, shares authorized | 1,000,000,000 | 1,000,000,000
Common Stock, par value | $ 0.0001 | $ 0.0001
Common stock, voting rights | 1 vote per share |
Class B Common Stock |  |
Class Of Stock [Line Items] |  |
Common Stock, shares authorized | 200,000,000 | 200,000,000
Common Stock, par value | $ 0.0001 | $ 0.0001
Common stock, voting rights | 10 votes per share |

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- Definition Basis of conversion of convertible common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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