Note 14. Stock Based Compensation (Tables)

12 Months Ended

Mar. 31, 2013

Schedules Of Options Exercised [Table Text Block]

	March 31, 2013		April 1, 2012		March 27, 2011
Intrinsic value of options exercised	$	1,443	$	79	$	100
Cash received related to option exercises		6,059		2,763		765
Tax benefit recorded		1,927		1,761		2,300

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Shares			Weighted Average Grant-Date Fair Value		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Unvested at March 28, 2010		834,204		$	8.20		1.04	$	6,106
Granted		399,183			6.76
Issued and released		(618,411	)		6.90
Forfeited		(57,878	)		7.52
Unvested at March 27, 2011		557,098		$	7.17		1.09	$	3,387
Granted		481,650			7.12
Issued and released		(271,830	)		7.25
Forfeited		(162,263	)		7.25
Unvested at April 1, 2012		604,655		$	7.13		2.38	$	5,079
Granted		331,894			8.40
Issued and released		(125,095	)		7.10
Forfeited		(79,250	)		6.96
Unvested at March 31, 2013		732,204		$	7.73		1.72	$	7,688
Vested and expected to vest, March 31, 2013		566,117					1.60	$	5,944

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	March 31, 2013					April 1, 2012					March27, 2011
Expected term of options (years)			4.36					4.30					4.40
Risk-free interest rate		0.5	–	0.6	%		0.7	–	1.5	%		1.3	–	2.0	%
Expected volatility		37	-	42	%		41	-	43	%		39	–	40	%
Expected dividend yield			—					—					—
Weighted average grant date fair value	$		2.80			$		2.22			$		2.28

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	March 31, 2013		April 1, 2012		March 27, 2011
Cost of sales	$	469	$	301	$	489
Research and development		789		1,239		3,241
Selling, general and administrative		3,530		2,210		3,651
Total stock-based compensation expense	$	4,788	$	3,750	$	7,381

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

	March 31, 2013				April 1, 2012				March 27, 2011
	Amount (in thousands)		Weighted Average Remaining Recognition Period (in years)		Amount (in thousands)		Weighted Average Remaining Recognition Period (in years)		Amount (in thousands)		Weighted Average Remaining Recognition Period (in years)
Options	$	6,771		2.8	$	8,119		2.8	$	7,290		2.4
RSUs		3,371		2.5		3,537		3.2		2,336		1.8
Total Stock-based compensation expense	$	10,142			$	11,656			$	9,626

Schedule of Incremental Stock Based Compensation [Table Text Block]

	March 31, 2013		April 1, 2012		March 27, 2011
Incremental stock-based compensation expense	$	—	$	—	$	327

Employee Stock Purchase Plan [Member]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares of Common Stock		Weighted Average Price per Share
Authorized to issue:		4,500	$	—
Reserved for future issuance:
Fiscal year ending March 31, 2013		1,392		—
Fiscal year ending April 1, 2012		1,418		—
Fiscal year ending March 27, 2011		1,480		—
Issued:
Fiscal year ending March 31, 2013		26		8.38
Fiscal year ending April 1, 2012		62		6.09
Fiscal year ending March 27, 2011		69		6.41

Stock Options [Member]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Outstanding Options / Quantity			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)		In-the-money Options Vested and Exercisable (in thousands)
Balance at March 28, 2010		5,345,504		$	8.01		5.38	$	1,882		235
Granted		2,113,190			6.60
Exercised		(125,920	)		6.07
Cancelled		(308,595	)		11.02
Forfeited		(1,294,715	)		6.93
Balance at March 27, 2011		5,729,464		$	7.61		4.74	$	147		103
Granted		3,100,595			6.33
Exercised		(422,749	)		6.54
Cancelled		(526,574	)		8.15
Forfeited		(1,535,429	)		6.70
Balance at April 1, 2012		6,345,307		$	7.23		4.67	$	9,474		1,193
Granted		2,540,010			8.32
Exercised		(875,459	)		6.92
Cancelled		(903,781	)		9.67
Forfeited		(893,744	)		6.41
Balance at March 31, 2013		6,212,333		$	7.48		5.04	$	19,199		1,481
Vested and expected to vest, March 31, 2013		5,326,478		$	7.44		4.89	$	16,758
Vested and exercisable, March 31, 2013		1,642,315		$	7.54		3.32	$	5,271

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			Options Outstanding						Options Exercisable
Range of Exercise Prices			Number Outstanding As of March 31, 2013		Weighted Average Remaining Contractual Terms (in years)		Weighted Average Exercise Price per Share		Number Exercisable As of March 31, 2013		Weighted Average Exercise Price per Share
$5.44	–	$6.43		2,395,886		4.95	$	6.23		723,635	$	6.15
6.44	–	7.68		1,404,367		4.44		7.28		443,730		7.12
7.70	–	8.48		1,338,230		5.50		8.11		216,300		8.29
8.51	–	14.32		1,073,717		5.45		9.77		258,517		11.55
15.67	–	16.00		133		1.14		15.67		133		15.67
Total				6,212,333		5.04	$	7.48		1,642,315	$	7.54