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Property, Plant And Equipment (Details) (USD $) | 12 Months Ended
--- | ---
Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 271,089,000 | $ 265,176,000 |
Less accumulated amortization and depreciation | (197,040,000) | (191,112,000) |
Property, Plant and Equipment, Net, Total | 74,049,000 | 74,064,000 |
Amortization and depreciation expense on property, plant and equipment | 9,500,000 | 9,200,000 | 16,800,000
Accumulated amortization on capital leases | 27,500,000 | 26,600,000 |
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 5,929,000 | 5,929,000 |
Buildings And Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 68,224,000 | 67,444,000 |
Building And Improvements - Capital Leases [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 11,202,000 | 11,202,000 |
Machinery And Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 155,162,000 | 152,154,000 |
Machinery And Equipment - Capital Leases [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 28,111,000 | 26,966,000 |
Construction In Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 2,461,000 | $ 1,481,000 |

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