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Restructuring (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Oct. 31, 2013 | Oct. 31, 2012
Restructuring and Related Activities [Abstract] |  |
Additional depreciation expense to be recorded for the fiscal year 2014 | $ 2.8 |
Additional depreciation expenses recognized during current period | $ 1.7 | $ 0.7
Data Centers |  |
Property, Plant and Equipment [Line Items] |  |
Average useful lives of data center | 60 months |
Revised average useful lives of data center | 45 months |

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