Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	Apr. 30, 2020	Jan. 31, 2020	Apr. 30, 2021	Apr. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance		$ 1,758,991			$ 1,758,991
Amortization of prior service costs and net    actuarial losses, net of tax of ($3,485)	$ 8,385		$ 3,898		11,382	$ 7,127
Foreign currency translation adjustments	(6,943)	28,433	(21,227)	$ 2,793	21,490	$ (18,434)
Accumulated other comprehensive loss, Ending balance	1,950,357				1,950,357
Amortization of prior service costs and net actuarial losses, tax					3,485
Cumulative translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance		(40,422)			(40,422)
Amortization of prior service costs and net    actuarial losses, net of tax of ($3,485)					0
Foreign currency translation adjustments					21,490
Accumulated other comprehensive loss, Ending balance	(18,932)				(18,932)
Pension and postretirement  benefit plan adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance		(185,696)			(185,696)
Amortization of prior service costs and net    actuarial losses, net of tax of ($3,485)					11,382
Foreign currency translation adjustments					0
Accumulated other comprehensive loss, Ending balance	(174,314)				(174,314)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), Beginning balance		(226,118)			(226,118)
Foreign currency translation adjustments	(6,943)	$ 28,433	$ (21,227)	$ 2,793
Accumulated other comprehensive loss, Ending balance	$ (193,246)				$ (193,246)