Fair Value Measurements (Tables)

9 Months Ended

12 Months Ended

Dec. 31, 2011

Mar. 31, 2011

Schedule Of Assets Carried At Fair Value


		Total		Quoted Prices in		Using Significant Other		Using Significant
		Carrying		Active Markets		Observable Inputs		Unobservable Inputs
		Value		(Level 1)		(Level 2)		(Level 3)
December 31, 2011:
Assets:
Cash equivalents	$	38,474	$	38,474	$	—	$	—
Short-term commercial paper		5,261		—		5,261		—



		Total		Quoted Prices in		Using Significant Other		Using Significant
		Carrying		Active Markets		Observable Inputs		Unobservable Inputs
		Value		(Level 1)		(Level 2)		(Level 3)
March 31, 2011:
Assets:
Cash equivalents	$	49,837	$	49,837	$	—	$	—
Short-term government-backed		76,371		—		76,371		—
securities
Short-term commercial paper		39,755		—		39,755		—
Derivatives		3,087		—		3,087		—

- Definition

Tabular disclosure of the total amount of gains or losses for the period which are included in earnings or resulted in a change to net assets which gains or losses have arisen from the use of significant unobservable inputs (Level 3) to measure the fair value of assets and liabilities. Such gains or losses are attributable to the change in unrealized gains or losses relating to those assets and liabilities so valued which are still held at the reporting date and which change are also considered for disclosure; it may be expected that a description of where those unrealized gains or losses are reported in the statement of income or the statement of financial position would also be disclosed.

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