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Debt - Joint Venture Debt (Narrative) (Details) | Apr. 30, 2013 | Apr. 04, 2013
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Debt Disclosure [Abstract] |  |
Percentage of voting interests acquired |  | 39.00%
Ownership percentage by parent | 65.00% | 65.00%

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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