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Significant Accounting Policies - Depreciation of Property and Equipment and Amortization of Capital Lease Assets (Details) | 12 Months Ended
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Apr. 30, 2015
Buildings | Minimum |
Property, Plant and Equipment |
Property, plant and equipment useful life | 25 years
Buildings | Maximum |
Property, Plant and Equipment |
Property, plant and equipment useful life | 40 years
Machinery and Equipment | Minimum |
Property, Plant and Equipment |
Property, plant and equipment useful life | 5 years
Machinery and Equipment | Maximum |
Property, Plant and Equipment |
Property, plant and equipment useful life | 30 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |