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Supplemental Balance Sheet Information (Details) (USD $)
In Millions, unless otherwise specified |
Jan. 31, 2012
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Apr. 30, 2011
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| Supplemental Balance Sheet Information [Abstract] | ||
| Deferred revenue | $ 14.2 | $ 11.3 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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