Retirement Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2018	Oct. 31, 2019
Retirement Benefits [Abstract]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	$ 2,500
Defined benefit plan, contributions by employer			$ 700
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	3,700
Supplemental benefit plan liability	4,300			$ 4,200
Deferred compensation liability	3,700			$ 3,800
Net periodic benefit cost:
Service cost	538	$ 977
Interest cost	293	283
Expected return on plan assets	(491)	(543)
Amortization of net loss	108	16
Net periodic benefit cost	$ 448	$ 733