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Restructuring Charges - Additional Information (Detail)	Apr. 30, 2021	Oct. 30, 2020	Jul. 31, 2020
August 2020 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force		5.00%
May 2020 Restructuring | Maximum
Restructuring Cost and Reserve [Line Items]
Reduction of global work force			1.00%
May 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	2.00%
April 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	1.00%
May 2018 Restructuring | Maximum
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	2.00%
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force	6.00%

X

- Definition

Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type: