Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	0 Months Ended
	Jul. 31, 2012	Feb. 08, 2012	Jan. 14, 2013	Apr. 11, 2013	May 17, 2012	Oct. 31, 2014	Oct. 31, 2013
Loss Contingencies [Line Items]
Surety bonds						$ 339,700,000
Total letters of credit						114,900,000	100,600,000
Total guarantees						30,400,000	37,000,000
Loss contingency amount accrued for probable losses						5,100,000
Amount of reasonably possible losses, Minimum						0
Amount of reasonably possible losses, Maximum						98,800,000
Effective date starting after October 31, 2013
Loss Contingencies [Line Items]
Surety bonds						6,900,000
Contract dispute, work performed by a third party administrative
Loss Contingencies [Line Items]
Loss contingency amount accrued for probable losses						3,400,000
Augustus
Loss Contingencies [Line Items]
Loss Contingency, estimate of possible loss						94,200,000
Damages sought amount		103,100,000
Payment awarded to plaintiffs	89,700,000
Augustus | Motion against others
Loss Contingencies [Line Items]
Damages sought amount	12,400,000		4,500,000
Bojorquez
Loss Contingencies [Line Items]
Payment awarded to plaintiffs				$ 2,500,000	$ 800,000