Investments - Additional Information (Details) $ in Millions	3 Months Ended
Jan. 25, 2020 USD ($) company	Apr. 25, 2020 company
Investments
Other-than-temporary impairment \| $	$ 6.0
Level 3
Investments
Preferred share investments, number of privately-held companies		2
Number of companies impaired	1

The number of privately-held companies in which the entity holds investments in preferred shares.

No definition available.

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- Definition

The number of privately-held companies impaired during the period

+ References

No definition available.

+ Details

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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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- Definition

Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562

+ Details

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- Details

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