The Company And Summary Of Significant Accounting Policies (Schedule Detailling Activity For The Allowance For Doubtful Accounts And Long-Term Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period	$ 278	$ 345	$ 503
Charges (credits) to operation expenses	163	123	3
Write-offs of accounts, net	(230)	(190)	(161)
Balance, end of period	211	278	345
Allowance For Long-Term Accounts Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period			91
Charges (credits) to operation expenses			8
Write-offs of accounts, net			$ (99)