Recently Issued Accounting Standards - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Apr. 30, 2018	Apr. 30, 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	$ 2,187	$ 3,814
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	(187)	(157)
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	$ (2,000)	$ (3,657)