Auction Rate Securities - Significant Assumptions Used to Determine Fair Value of Auction Rate Securities (Detail)	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Libor plus stated yield	2.00%	2.00%
Yields	2.15%	2.15%
Minimum
Schedule of Available-for-sale Securities [Line Items]
Libor plus the stated discount rate	0.38%	0.28%
Securities Average Life	4 years	4 years
Maximum
Schedule of Available-for-sale Securities [Line Items]
Libor plus the stated discount rate	2.13%	4.06%
Securities Average Life	10 years	10 years