Investments In Available-For-Sale Securities (Tables)

6 Months Ended

Oct. 31, 2011

Investments In Available-For-Sale Securities [Abstract]

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

	(in 000s)
As of	October 31, 2011									April 30, 2011
	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	$	2,008	$	21	$	—		$	2,029	$	3,023	$	58	$	—		$	3,081
Long-term:
Mortgage-backed
securities		297,157		3,716		(209	)		300,664		157,970		401		(194	)		158,177
Municipal bonds		5,277		369		—			5,646		5,312		347		—			5,659
		302,434		4,085		(209	)		306,310		163,282		748		(194	)		163,836
Total	$	304,442	$	4,106	$	(209	)	$	308,339	$	166,305	$	806	$	(194	)	$	166,917

(1) At October 31, 2011 and 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)
		Cost Basis		Fair Value
Maturing in:
Less than one year	$	2,008	$	2,029
Two to five years		4,219		4,467
Six to ten years		1,058		1,179
Beyond		297,157		300,664
	$	304,442	$	308,339