Derivative Financial Instruments - Fair Values of Assets and Liabilities Measured and Recognized at Fair Value (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Oct. 31, 2014
Derivative liabilities:
Total fair value	$ 19,427	$ 16,681
Other Receivables
Derivative assets:
Derivative assets	20,871	16,683
Accrued Liabilities
Derivative liabilities:
Derivative liabilities	(749)	(2)
Other Long-term Liabilities
Derivative liabilities:
Derivative liabilities	(695)
Level 1
Derivative liabilities:
Total fair value	0	0
Level 1 | Other Receivables
Derivative assets:
Derivative assets	0	0
Level 1 | Accrued Liabilities
Derivative liabilities:
Derivative liabilities	0	0
Level 1 | Other Long-term Liabilities
Derivative liabilities:
Derivative liabilities	0
Level 2
Derivative liabilities:
Total fair value	19,427	16,681
Level 2 | Other Receivables
Derivative assets:
Derivative assets	20,871	16,683
Level 2 | Accrued Liabilities
Derivative liabilities:
Derivative liabilities	(749)	(2)
Level 2 | Other Long-term Liabilities
Derivative liabilities:
Derivative liabilities	(695)
Level 3
Derivative liabilities:
Total fair value	0	0
Level 3 | Other Receivables
Derivative assets:
Derivative assets	0	0
Level 3 | Accrued Liabilities
Derivative liabilities:
Derivative liabilities	0	0
Level 3 | Other Long-term Liabilities
Derivative liabilities:
Derivative liabilities	$ 0