Represents the maturity period of available for sale securities.

No definition available.

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- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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- Definition

This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified neither as held-to-maturity nor trading securities.

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- Definition

This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Investments (Details) (USD $)	3 Months Ended		9 Months Ended
Investments (Details) (USD $)	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Mar. 31, 2012
Investments in marketable securities - Available for sale:
Cost or Amortized Cost	$ 471,000		$ 471,000		$ 3,592,000
Gross Unrealized Gains	5,000		5,000		39,000
Estimated Fair Value	476,000		476,000		3,631,000
Investments in marketable securities - Reported as:
Short-term investments	476,000		476,000		3,631,000
Estimated Fair Value	476,000		476,000		3,631,000
Maturities Of Marketable Fixed-Income Securities Classified As Available For Sale - Amortized Cost
Due within one year	471,000		471,000
Total amortized cost of marketable fixed-income securities classified as available-for-sale	471,000		471,000
Maturities Of Marketable Fixed-Income Securities Classified As Available For Sale - Estimated Fair Value
Due within one year	476,000		476,000
Total estimated fair value of marketable fixed-income securities classified as available-for-sale	476,000		476,000
Investments (Textuals)
Realized gains or losses from the sale of marketable securities approximate value	(200,000)		(300,000)
Proceeds from the sales of marketable securities	2,000,000	1,800,000	4,400,000	50,000,000
Maximum
Investments (Textuals)
Realized gains or losses from the sale of marketable securities approximate value		100,000		100,000
Money market funds
Investments in marketable securities - Available for sale:
Cost or Amortized Cost					1,627,000
Estimated Fair Value					1,627,000
Investments in marketable securities - Reported as:
Estimated Fair Value					1,627,000
Auction rate securities
Investments in marketable securities - Available for sale:
Cost or Amortized Cost	471,000		471,000		1,965,000
Gross Unrealized Gains	5,000		5,000		39,000
Estimated Fair Value	476,000		476,000		2,004,000
Investments in marketable securities - Reported as:
Estimated Fair Value	476,000		476,000		2,004,000
Auction rate securities \| Maximum
Additional disclosure
Liquidation period			1
Investments (Textuals)
Impairment charge		$ 300,000		$ 300,000