Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended
	Jan. 31, 2015	Aug. 01, 2012	Apr. 11, 2013	May 17, 2012	Jul. 31, 2012	Dec. 31, 2014	Oct. 31, 2014
Loss Contingencies
Surety bonds	$ 333,500,000
Total guarantees	27,000,000						30,400,000
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest	33.00%
Loss contingency amount accrued for probable losses	3,400,000
Amount of reasonably possible losses, Minimum	0
Amount of reasonably possible losses, Maximum	4,500,000
Loss Contingency Damages Awarded Percent		30.00%
Contract Dispute, Work Performed by a Third Party Administrative
Loss Contingencies
Loss contingency amount accrued for probable losses	2,300,000
Augustus [Member] | Motion against others
Loss Contingencies
Damages sought amount		4,500,000
Bojorquez
Loss Contingencies
Payment awarded to plaintiffs			2,500,000	800,000
Effective date starting after July 31, 2014
Loss Contingencies
Surety bonds	6,100,000
Standby Letters of Credit
Loss Contingencies
Standby letters of credit	114,300,000						114,900,000
Parental [Member]
Loss Contingencies
Total guarantees	35,000,000
Augustus [Member]
Loss Contingencies
Payment awarded to plaintiffs		89,700,000			89,700,000
Augustus [Member] | Reversed [Member]
Loss Contingencies
Payment awarded to plaintiffs						$ 89,700,000