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Summary of Significant Accounting Policies - Schedule of Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Accounting Policies [Abstract]
Balance at beginning of year	$ 229	$ 194	$ 311
Bad debt provision	55	116	34
Doubtful accounts written off (net)	(113)	(81)	(151)
Balance at end of year	$ 171	$ 229	$ 194

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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