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Contingencies (Detail) - USD ($) $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Jul. 05, 2015 | Jun. 25, 2015
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Proceeds from legal settlements |  | $ 2,578 |  |
Damages awarded | $ 4,411 |  |  |
Legal settlement, value |  |  |  | $ 3,500
Legal settlement, asset value |  |  | $ 1,667 |
Legal settlement, expense |  |  | $ 1,833 |

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