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Recently Issued Accounting Standards - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jan. 31, 2018 | Aug. 31, 2018
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%
Other Expense [Member] | Accounting Standards Update 2017-07 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification due to change in accounting principles | $ 1,627 |
Cost of Goods Sold [Member] | Accounting Standards Update 2017-07 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification due to change in accounting principles | 30 |
Selling, General and Administrative Expenses [Member] | Accounting Standards Update 2017-07 [Member] |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Reclassification due to change in accounting principles | $ (1,657) |

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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=108410482&loc=d3e1928-114920 + Details
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- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. + 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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