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Restructuring Charges (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2014 USD ($) | Jan. 31, 2012 plant | Apr. 30, 2015 USD ($) plant | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring charges |  |  | $ (240) | $ (234) | $ 1,433
Number of manufacturing plants held for sale | plant |  |  | 0 |  |
Recognized gain from sale of plant | $ 300 |  | $ 300 |  |
2012 Restructuring Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Plants committed to close | plant |  | 2 |  |  |
Recognized recurring operating costs for closed facilities |  |  | 100 |  |
2012 And 2009 Restructuring Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring charges |  |  | $ (200) | $ (200) | $ 1,400

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