Fair Value Measurements (Tables)

12 Months Ended

Apr. 30, 2013

Schedule of financial assets measured at fair value on a recurring basis

The Company's financial assets measured at fair value on a recurring basis at April 30, 2013, were as follows (in thousands):

	Fair Value Measurement Using

Description	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
Auction rate securities	$	—	$	—	$	5,687	$	5,687
Convertible bonds		—		6,173		2,898		9,071

Total	$	—	$	6,173	$	8,585	$	14,758

Schedule of reconciliation between beginning and ending balances of items measured at fair value on recurring basis

The following table provides a reconciliation between the beginning and ending balances of items measured at fair value on a recurring basis in the table above that used significant unobservable inputs (Level 3) (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

Description	Auction Rate Securities
Balance at May 1, 2012	$	6,196
Transfers to Level 3		—
Total gains (realized or unrealized)
Included in earnings		—
Included in other comprehensive income		(48	)
Purchases, issuances and settlements, net		2,437

Balance at April 30, 2013	$	8,585

The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at April 30, 2013	$	—

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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