Derivative Financial Instruments - Fair Values of Assets and Liabilities Measured and Recognized at Fair Value (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Oct. 31, 2013
Derivative liabilities:
Total fair value	$ 3,063	$ (905)
Other Receivables [Member]
Derivative assets:
Derivative assets	3,746	2,026
Other Assets [Member]
Derivative assets:
Derivative assets	166	382
Accrued Liabilities [Member]
Derivative liabilities:
Derivative liabilities	(849)	(3,313)
Level 1 [Member]
Derivative liabilities:
Total fair value	0	0
Level 1 [Member] | Other Receivables [Member]
Derivative assets:
Derivative assets	0	0
Level 1 [Member] | Other Assets [Member]
Derivative assets:
Derivative assets	0	0
Level 1 [Member] | Accrued Liabilities [Member]
Derivative liabilities:
Derivative liabilities	0	0
Level 2 [Member]
Derivative liabilities:
Total fair value	3,063	(905)
Level 2 [Member] | Other Receivables [Member]
Derivative assets:
Derivative assets	3,746	2,026
Level 2 [Member] | Other Assets [Member]
Derivative assets:
Derivative assets	166	382
Level 2 [Member] | Accrued Liabilities [Member]
Derivative liabilities:
Derivative liabilities	(849)	(3,313)
Level 3 [Member]
Derivative liabilities:
Total fair value	0	0
Level 3 [Member] | Other Receivables [Member]
Derivative assets:
Derivative assets	0	0
Level 3 [Member] | Other Assets [Member]
Derivative assets:
Derivative assets	0	0
Level 3 [Member] | Accrued Liabilities [Member]
Derivative liabilities:
Derivative liabilities	$ 0	$ 0