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Recently Issued Accounting Standards - Additional Information (Detail) - USD ($)	Oct. 31, 2020	Oct. 31, 2019	Aug. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating right of use lease assets	$ 122,125,000	$ 0
Operating Lease, Liability	126,235,000
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating right of use lease assets	122,125,000	130,538,000
Operating Lease, Liability	$ 126,235,000	$ 134,853,000
New Accounting Guidance Issued and Not Yet Adopted
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Defined benefit plan effect of percentage change in assumed health care cost trend rates			1.00%

X

- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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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.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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