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Supplementary Cash Flow Information (Tables)
6 Months Ended
Oct. 31, 2014
Supplemental Cash Flow Elements [Abstract]  
Schedule of cash flow supplemental disclosures
   
Six Months Ended October 31,
 
($ in thousands)
 
2014
   
2013
 
State and local income tax payments
  $ (116 )   $ (46 )
Federal income tax payments to the Parent
  $ (1,850 )   $ (354 )