Commitments and Contingencies - Additional Information (Detail) - USD ($)	Aug. 01, 2012	Jul. 31, 2012	Apr. 30, 2016	Oct. 31, 2015	Dec. 31, 2014
Loss Contingencies
Surety bonds			$ 391,500,000
Standby letters of credit			127,600,000	$ 112,900,000
Guarantee obligation			$ 96,100,000	$ 90,500,000
Subsidiary ownership interest percentage			33.00%
Loss contingency amount accrued for probable losses			$ 11,400,000
Amount of reasonably possible losses, Minimum			0
Amount of reasonably possible losses, Maximum			14,000,000.0
Augustus
Loss Contingencies
Payment awarded to plaintiffs	$ 4,500,000	$ 89,700,000
Percentage of damages awarded	30.00%
Reversal of initial award					$ 89,700,000
Parental
Loss Contingencies
Total guarantees			35,000,000
Future Period Two
Loss Contingencies
Surety bonds			$ 700,000