Stock-Based Compensation - Summarized Activity Related to Restricted Stock Units (Detail) - Restricted Stock Unit	3 Months Ended
	Jan. 31, 2022 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	67,000
Granted (in shares) | shares	39,000
Forfeited (in shares) | shares	(1,000)
Vested (in shares) | shares	(14,000)
Ending balance (in shares) | shares	91,000
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 202,810
Granted (in dollars per share) | $ / shares	266.11
Forfeited (in dollars per share) | $ / shares	219.03
Vested (in dollars per share) | $ / shares	201.32
Ending balance (in dollars per share) | $ / shares	$ 229.66