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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Reconciliation of change in gross unrecognized tax benefits |  |  |
Balance, beginning of year | $ 12,222 | $ 16,993 | $ 30,272
Increase in benefit as a result of tax positions taken in prior years | 2,148 | 2,140 | 1,575
Increase in benefit as a result of tax positions taken in current year | 1,126 | 949 | 431
Decrease in benefit as a result of settlements | (2,670) | (4,707) | (9,174)
Decrease in benefit as a result of lapse of statute of limitations | (4,929) | (3,153) | (6,111)
Balance, end of year | $ 7,897 | $ 12,222 | $ 16,993

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