Income Taxes - Valuation Allowance of Gross Deferred Tax Assets (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Oct. 31, 2015 |
Oct. 31, 2014 |
Oct. 31, 2013 |
|
| Valuation allowance against gross deferred tax assets: | |||
| Valuation allowance, beginning balance | $ 1,496,835 | $ 1,487,299 | $ 1,488,994 |
| Additions | 0 | 9,536 | 0 |
| Deductions | 1,163 | 0 | 1,695 |
| Valuation allowance, ending balance | $ 1,495,672 | $ 1,496,835 | $ 1,487,299 |