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Employee Share-Based Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 15, 2014
Dec. 31, 2011
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Dec. 12, 2014
Oct. 31, 2014
Employee Share Based Plans Details [Line Items]                
Maximum allowable withholdings         50.00%      
Compensation expense     $ 1,317 $ 822 $ 4,596 $ 5,025    
Liability     $ 12,460   $ 12,460     $ 15,130
ESPP exercise price as a percent         95.00%      
Stock Compensation Plan                
Employee Share Based Plans Details [Line Items]                
Performance period         3 years      
Retention Stock Unit Award President And Cheif Executive Officer | Stock Compensation Plan                
Employee Share Based Plans Details [Line Items]                
Retention stock unit award vesting period         5 years      
Unvested Shares Issued To CEO   64,700            
Incentive Compensation Plan Percentage Of Common Stock Vested         In accordance with the vesting schedule, 20% of the units vested on December 15, 2014, 30% of the units vest on December 15, 2015 and 50% of the units vest on December 15, 2016      
Vested on December 15, 2014 | Retention Stock Unit Award President And Cheif Executive Officer | Stock Compensation Plan                
Employee Share Based Plans Details [Line Items]                
Common stock vesting percentage         20.00%      
Stock Award Vested, Shares, Gross 14,461              
Payments Related to Tax Withholding for Share-based Compensation $ 300              
Stock Issued During Period, Shares, Share-based Compensation, Gross 7,231              
Share Price             $ 37.89  
Vest on December 15, 2015 | Retention Stock Unit Award President And Cheif Executive Officer | Stock Compensation Plan                
Employee Share Based Plans Details [Line Items]                
Common stock vesting percentage         30.00%      
Vest on December 15, 2016 | Retention Stock Unit Award President And Cheif Executive Officer | Stock Compensation Plan                
Employee Share Based Plans Details [Line Items]                
Common stock vesting percentage         50.00%