Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2012		Mar. 30, 2012
Schedule of Investments [Line Items]
Amortized Cost	$ 22,363		$ 26,208
Gross Unrealized Gains	25		45
Gross Unrealized Losses	(5)		(8)
Fair Value	22,383	[1]	26,245
Amortized Cost
Maturing in one year	8,472
Maturing in one to five years	13,890
Total	22,363		26,208
Estimated Market Value
Maturing in one year	8,480
Maturing in one to five years	13,903
Total	22,383	[1]	26,245
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	22,383	[1]	26,245
Recurring [Member]
Schedule of Investments [Line Items]
Fair Value	22,383	[1]	26,245	[1]
Estimated Market Value
Total	22,383	[1]	26,245	[1]
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	22,383	[1]	26,245	[1]
Recurring [Member] | Level 1 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	3,002	[1]	3,952	[1]
Recurring [Member] | Level 2 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	19,381	[1]	22,293	[1]
Recurring [Member] | U.S. Treasury notes [Member]
Schedule of Investments [Line Items]
Fair Value	3,002		3,952
Estimated Market Value
Total	3,002		3,952
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	3,002		3,952
Recurring [Member] | U.S. Treasury notes [Member] | Level 1 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	3,002		3,952
Recurring [Member] | U.S. Treasury notes [Member] | Level 2 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value			0
Recurring [Member] | U.S. government agencies [Member]
Schedule of Investments [Line Items]
Fair Value	7,898		7,475
Estimated Market Value
Total	7,898		7,475
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	7,898		7,475
Recurring [Member] | U.S. government agencies [Member] | Level 1 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value			0
Recurring [Member] | U.S. government agencies [Member] | Level 2 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	7,898		7,475
Recurring [Member] | Corporate notes and bonds [Member]
Schedule of Investments [Line Items]
Fair Value	9,066		10,778
Estimated Market Value
Total	9,066		10,778
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	9,066		10,778
Recurring [Member] | Corporate notes and bonds [Member] | Level 1 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value			0
Recurring [Member] | Corporate notes and bonds [Member] | Level 2 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	9,066		10,778
Recurring [Member] | Asset backed securities [Member]
Schedule of Investments [Line Items]
Fair Value	1,916		3,537
Estimated Market Value
Total	1,916		3,537
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	1,916		3,537
Recurring [Member] | Asset backed securities [Member] | Level 1 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value			0
Recurring [Member] | Asset backed securities [Member] | Level 2 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	1,916		3,537
Recurring [Member] | Other debt securities [Member]
Schedule of Investments [Line Items]
Fair Value	501		503
Estimated Market Value
Total	501		503
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	501		503
Recurring [Member] | Other debt securities [Member] | Level 1 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value			0
Recurring [Member] | Other debt securities [Member] | Level 2 [Member]
Financial assets measured at fair value [Abstract]
Assets, fair value	501		503
U.S. Treasury notes [Member]
Schedule of Investments [Line Items]
Amortized Cost	3,003		3,953
Gross Unrealized Gains	0		2
Gross Unrealized Losses	(1)		(3)
Fair Value	3,002		3,952
Amortized Cost
Total	3,003		3,953
Estimated Market Value
Total	3,002		3,952
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	3,002		3,952
U.S. government agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	7,892		7,465
Gross Unrealized Gains	7		10
Gross Unrealized Losses	(1)		0
Fair Value	7,898		7,475
Amortized Cost
Total	7,892		7,465
Estimated Market Value
Total	7,898		7,475
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	7,898		7,475
Corporate notes and bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost	9,053		10,757
Gross Unrealized Gains	15		24
Gross Unrealized Losses	(2)		(3)
Fair Value	9,066		10,778
Amortized Cost
Total	9,053		10,757
Estimated Market Value
Total	9,066		10,778
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	9,066		10,778
Asset backed securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,914		3,530
Gross Unrealized Gains	3		9
Gross Unrealized Losses	(1)		(2)
Fair Value	1,916		3,537
Amortized Cost
Total	1,914		3,530
Estimated Market Value
Total	1,916		3,537
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	1,916		3,537
Other debt securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	501		503
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	501		503
Amortized Cost
Total	501		503
Estimated Market Value
Total	501		503
Financial assets measured at fair value [Abstract]
Short-term investments, fair value	$ 501		$ 503

[1] Included in short-term investments on the Company's condensed consolidated balance sheet.