|**Marketable Securities (Tables)**   | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|**Marketable Securities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Composition of Marketable Securities | The composition of these securities as ofJuly 31, 2016andOctober 31, 2015is as follows.July 31, 2016October 31, 2015In thousandsCostFairValueCostFairValueCurrent trading securities:Money markets$26$26$51$51Mutual funds217250114185Total current trading securities243276165236Noncurrent trading securities:Money markets579579465465Mutual funds4,0454,5573,6254,201Total noncurrent trading securities4,6245,1364,0904,666Total trading securities$4,867$5,412$4,255$4,902
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|                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                     | July 31, 2016                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|In thousands                         | Cost                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Current trading securities:          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Money markets                        | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Mutual funds                         | 217                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Total current trading securities     | 243                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Noncurrent trading securities:       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Money markets                        | 579                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Mutual funds                         | 4,045                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Total noncurrent trading securities  | 4,624                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Total trading securities             | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

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duration X- DefinitionTabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.
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