Fair Value Measurements (Tables)

9 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Schedule Of Financial Assets And Liabilities

	Total Fair Value			Level I		Level II			Level III
ASSETS:
Cash and cash equivalents	$	102,762		$	102,762	$	0		$	0
U.S. government and municipal obligations		32,097			32,097		0			0
Commercial paper		16,080			0		16,080			0
Corporate bonds		21,040			21,040		0			0
Certificate of deposits		3,202			0		3,202			0
Auction rate securities		17,108			0		0			17,108
Derivative financial instruments		8			0		8			0
	$	192,297		$	155,899	$	19,290		$	17,108
LIABILITIES:
Contingent purchase consideration	$	(8,000	)	$	0	$	0		$	(8,000	)
Contingent contractual non-compliance liability	$	(1,600	)	$	0	$	0		$	(1,600	)
Derivative financial instruments		(540	)		0		(540	)		0
	$	(10,140	)	$	0	$	(540	)	$	(9,600	)

Reconciliation Of Changes In Fair Value Of Level III Financial Assets

	Auction Rate Securities			Contingent Purchase Consideration		Contingent Contractual Non-compliance Liability
Balance at beginning of period	$	17,482		$	00	$	0
Additions to Level III		0			8,000		1,600
ARSs redeemed by issuers at par		(500	)		00		0
Unrealized gains included in accumulated other comprehensive income (loss)		157			00		0
Unrealized gain (loss) included in the statement of operations		(31	)		00		0
Balance at end of period	$	17,108		$	8,000	$	1,600