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Investments (Tables)

12 Months Ended

Mar. 31, 2011

Mar. 31, 2010

Notes to Financial Statements [Abstract]

Summary of available-for-sale securities

Available-for-sale Securities
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Government agency bonds	$	389,801	$	215	$	(622	)	$	389,394
Municipal bonds		156,415		1,290		---			157,705
Auction rate securities		14,151		---		---			14,151
Marketable equity securities		58,402		---		---			58,402
Corporate bonds		392,108		2,983		(235	)		394,856
	$	1,010,877	$	4,488	$	(857	)	$	1,014,508

Summary of trading securities

	Trading Securities
	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
ARS	$	23,086	$	---	$	---	$	23,086
Put option on ARS		1,814		---		---		1,814
	$	24,900	$	---	$	---	$	24,900

Summary of amortized cost and estimated fair value of available-for-sale securities, by maturity

	Adjusted Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale
Due in one year or less	$	143,447	$	903	$	(2	)	$	144,348
Due after one year and through five years		815,352		3,406		(1,532	)		817,226
Due after five years and through ten years		---		---		---			---
Due after ten years		12,475		---		---			12,475
	$	971,274	$	4,309	$	(1,534	)	$	974,049

- Definition

This item represents the entire disclosure related to Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the entire disclosure related to Trading Securities (and certain trading assets) which consist of all investments in certain debt and equity securities (and other assets) that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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