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Subsequent Event (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions | Feb. 22, 2021 | Feb. 18, 2021 | Feb. 17, 2021
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Subsequent Event [Line Items] |  |  |
Proceeds from the Offering | $ 1,091.6 |  |
Public Offering |  |  |
Subsequent Event [Line Items] |  |  |
Number of shares issued and sold (in shares) |  |  | 9,804,000
Over-Allotment Option |  |  |
Subsequent Event [Line Items] |  |  |
Number of shares issued and sold (in shares) |  | 1,470,600 |
Offering price per share (in dollars per share) |  |  | $ 102.00
Over-Allotment Option - Selling Stockholders |  |  |
Subsequent Event [Line Items] |  |  |
Number of shares issued and sold (in shares) |  | 300,000 |
Over-Allotment - The Company |  |  |
Subsequent Event [Line Items] |  |  |
Number of shares issued and sold (in shares) |  | 1,170,600 |

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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=chgg_OverAllotmentTheCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |