Investments (Tables)

12 Months Ended

Apr. 30, 2012

Investments [Abstract]

Amortized Cost And Fair Value Of Securities Available-For-Sale

	(in 000s)
	2012									2011
As of April 30,	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses (1)			Fair Value
Short-term:
Municipal bonds	$	1,008	$	29	$	—		$	1,037	$	3,023	$	58	$	—		$	3,081
Long-term:
Mortgage-backed securities		361,184		5,620		(121	)		366,683		157,970		401		(194	)		158,177
Municipal bonds		4,236		396		—			4,632		5,312		347		—			5,659
		365,420		6,016		(121	)		371,315		163,282		748		(194	)		163,836
	$	366,428	$	6,045	$	(121	)	$	372,352	$	166,305	$	806	$	(194	)	$	166,917

⁽¹⁾  At April 30, 2012, mortgage-backed securities with a cost of $8.1 million and gross unrealized losses of $21 thousand had been in a continuous loss position for more than twelve months. At April 30, 2011, we had no investments that had been in a continuous loss position for more than twelve months.

Contractual Maturities Of AFS Debt Securities At Varying Dates Over The Next 30 Years

	(in 000s)
As of April 30, 2012	Cost Basis		Fair Value
Maturing in:
Less than one year	$	1,008	$	1,037
Two to five years		4,236		4,632
Beyond		361,184		366,683
	$	366,428	$	372,352