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Commitments (Letters of Credit and Restricted Cash Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 28, 2018 USD ($) debt_instrument | Dec. 29, 2017 USD ($)
Operating Leased Assets [Line Items] |  |
Collateral provided for purchasing card program | $ 3,000,000 |
Workers Compensation Insurance Policy |  |
Operating Leased Assets [Line Items] |  |
Line of credit borrowing capacity | 100,000 | $ 600,000
Building lease |  |
Operating Leased Assets [Line Items] |  |
Line of credit borrowing capacity | $ 500,000 |
Standby letters of credit |  |
Operating Leased Assets [Line Items] |  |
Number of letters of credit entered into (in debt instruments) | debt_instrument | 2 |
Line of credit borrowing capacity | $ 1,000,000 | $ 1,000,000.0
Letters of credit outstanding | $ 0 |

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- Definition Collateral Provided For Purchasing Card Program + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Debt Instrument, Number of Instruments + References No definition available. + Details
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Namespace Prefix: | exel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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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
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Namespace Prefix: |
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Balance Type: |
Period Type: |