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Income Taxes - Schedule of Effective Federal Income Tax Rates, Computed and Expected (Detail)
12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Income Taxes [Line Items]      
Computed "expected" statutory federal income tax rate 35.00% 35.00% 35.00%
State income taxes, net of federal income tax benefit (18.70%) 0.40% (10.00%)
Foreign tax rate differential (72.40%) (16.40%) 15.70%
Foreign tax exempt income 224.60% 18.80% (38.20%)
Goodwill impairment   (76.50%)  
Stock-based compensation (152.00%) (5.70%) 4.20%
Uncertain tax positions 76.40% 215.50% (3.10%)
Valuation allowance (513.20%) (118.40%) 133.10%
Other 74.60% (8.20%) 16.10%
Effective income tax rate (345.70%) 44.50% 152.80%