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Goodwill (Details Textuals) (USD $) In Millions, unless otherwise specified | Jul. 31, 2012 | Jul. 31, 2011
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Goodwill [Abstract] |  |
Goodwill impairment losses | $ 21.8 | $ 21.8

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- Definition The accumulated impairment losses related to goodwill as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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