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Summary of Significant Accounting Policies - Schedule of Activity in Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Accounting Policies [Abstract]
Balance at beginning of year	$ 311	$ 250	$ 259
Bad debt provision	34	214	60
Doubtful accounts written off (net)	(151)	(153)	(69)
Balance at end of year	$ 194	$ 311	$ 250

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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