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Accumulated Other Comprehensive Loss and Reclassifications Adjustments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Oct. 29, 2016
Oct. 31, 2015
Apr. 30, 2016
Accumulated other comprehensive loss          
Balance, net of $134 of taxes, as of April 30, 2016     $ (201)    
Unrealized gains, net of $29 of taxes     43    
Other comprehensive income, tax     90   $ 134
Balance, net of $90 or taxes, as of October 29, 2016 $ (158)   (158)   (201)
Unrealized gain, tax portion 17 $ 17 29 $ 18  
Available-for-sale securities.          
Accumulated other comprehensive loss          
Balance, net of $134 of taxes, as of April 30, 2016     (201)    
Unrealized gains, net of $29 of taxes     43    
Balance, net of $90 or taxes, as of October 29, 2016 $ (158)   $ (158)   $ (201)