Maintenance Contracts (Schedule Of Deferred Maintenance Revenue) (Details) (USD $)	3 Months Ended	9 Months Ended
Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012
Maintenance Contracts [Abstract]
Deferred maintenance revenue beginning balance	$ 6,602,000	$ 6,802,000	$ 8,302,000	$ 8,420,000
Deferred maintenance revenue recognized during period	(3,803,000)	(4,548,000)	(11,832,000)	(12,317,000)
Deferred maintenance revenue of new maintenance contracts	3,512,000	6,075,000	9,841,000	12,226,000
Deferred maintenance revenue ending balance	6,311,000	8,329,000	6,311,000	8,329,000
Long-term deferred maintenance revenue	$ 400,000		$ 400,000		$ 300,000

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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.

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Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date 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.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability 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.

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