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Recently Issued Accounting Standards - Additional Information (Detail) - USD ($) $ in Thousands | Apr. 30, 2020 | Nov. 01, 2019 | Aug. 31, 2018
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating right-of-use assets | $ 126,129 |  |
Operating lease liabilities | 130,264 |  |
ASU 2016-02 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating right-of-use assets | 126,129 | $ 130,583 |
Operating lease liabilities | $ 130,264 | $ 134,853 |
New Accounting Guidance Issued and Not Yet Adopted [Member] |  |  |
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%

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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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=77888419&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=77888419&loc=SL77918627-209977 + Details
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