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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)

X

- 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

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+ References

No definition available.

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- Definition

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+ References

No definition available.

+ Details

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