Note 14 - Stock-based Compensation (Tables)

12 Months Ended

Mar. 27, 2016

Notes Tables

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

			Weighted
	Shares of		Average
	Common Stock		Price per Share
Authorized to issue:		4,500
Reserved for future issuance:
Fiscal year ending March 27, 2016		1,317
Fiscal year ending March 29, 2015		1,346
Fiscal year ending March 30, 2014		1,372
Issued:
Fiscal year ending March 27, 2016		29	$	7.29
Fiscal year ending March 29, 2015		26	$	10.01
Fiscal year ending March 30, 2014		20	$	11.38

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

				Options Outstanding						Options Exercisable
						Weighted
				Number		Average				Number
				Outstanding		Remaining		Weighted		Exercisable		Weighted
				As of		Contractual		Average		As of		Average
Range of				March 27,		Terms		Exercise		March 27,		Exercise
Exercise Prices				2016		(in years)		Price per Share		2016		Price per Share
	$1.57	-	$5.92		1,810,701		6.26	$	5.66		61,356	$	3.93
	5.94	-	6.43		1,747,817		3.15		6.27		1,353,132		6.32
	6.60	-	9.03		1,612,878		2.97		8.13		1,194,990		8.03
	9.17	-	10.80		1,663,868		4.75		9.70		873,389		9.67
	10.96	-	13.93		887,119		4.99		12.38		552,936		12.35
Total					7,722,383		4.40	$	7.96		4,035,803	$	8.34

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

						Weighted
						Average				In-the-money
				Weighted		Remaining		Aggregate		Options
	Outstanding			Average		Contractual		Intrinsic		Vested and
	Options /			Exercise		Term		Value		Exercisable
	Quantity			Price per Share		(in years)		(in thousands)		(in thousands)
Balance at March 31, 2013		6,212,333		$	7.48		5.04	$	19,199		1,481
Granted		2,482,650			11.89
Exercised		(784,864	)		7.14
Cancelled		(10,834	)		10.92
Forfeited		(685,437	)		8.02
Balance at March 30, 2014		7,213,848		$	8.98		5.02	$	21,301		2,170
Granted		2,624,778			8.70
Exercised		(864,222	)		7.05
Cancelled		(291,769	)		12.36
Forfeited		(1,073,013	)		10.45
Balance at March 29, 2015		7,609,622		$	8.77		4.86	$	14,377		2,850
Granted		2,242,720			5.93
Exercised		(378,559	)		6.44
Cancelled		(470,759	)		9.20
Forfeited		(1,280,641	)		9.23
Balance at March 27, 2016		7,722,383		$	7.96		4.40	$	87		48
Vested and expected to vest, March 27, 2016		7,086,350
Vested and exercisable, March 27, 2016		4,035,803

Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]

	March 27,		March 29,		March 30,
	2016		2015		2014
Intrinsic value of options exercised	$	642	$	2,543	$	3,887
Cash received related to option exercises		2,439		6,095		9,493
Tax benefit recorded		261		1,655		6,669

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

						Weighted
						Average
				Weighted		Remaining
				Average		Contractual		Aggregate
				Grant-Date		Term		Intrinsic
	Shares			Fair Value		(in years)		Value
Unvested at March 31, 2013		732,204		$	8.25		1.72	$	7,688
Granted		828,995			11.27
Issued and released		(346,407	)		9.07
Forfeited		(37,666	)		9.52
Unvested at March 30, 2014		1,177,126		$	10.10		1.62	$	13,784
Granted		509,370			8.86
Issued and released		(414,242	)		9.44
Forfeited		(199,329	)		11.87
Unvested at March 29, 2015		1,072,925		$	9.43		1.50	$	11,051
Granted		338,762			8.55
Issued and released		(596,468	)		9.10
Forfeited		(224,386	)		9.10
Unvested at March 27, 2016		590,833		$	9.39		1.45	$	3,108
Vested and expected to vest, March 27, 2016		466,994			9.39

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

	March 27,			March 29,			March 30,
	2016			2015			2014
Expected term of options (years)		4.62			4.63			4.45
Risk-free interest rate		1.3	%		1.2	%		1.0	%
Expected volatility		34.2	%		32.4	%		32.6	%
Expected dividend yield		—			—			—
Weighted average grant date fair value	$	1.83		$	2.80		$	3.40

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

	March 27,		March 29,		March 30,
	2016		2015		2014
Cost of sales	$	379	$	1,105	$	714
Research and development		1,216		2,661		1,974
Selling, general and administrative		3,986		9,848		6,164
Total stock-based compensation expense	$	5,581	$	13,614	$	8,852

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

	March 27, 2016				March 29, 2015				March 30, 2014
			Weighted				Weighted				Weighted
			Average				Average				Average
			Remaining				Remaining				Remaining
			Recognition				Recognition				Recognition
	Amount		Period		Amount		Period		Amount		Period
	(in thousands)		(in years)		(in thousands)		(in years)		(in thousands)		(in years)
Options	$	6,385		2.7	$	8,579		2.3	$	9,958		2.7
Performance options		-		-		380		1.9		242		2.2
RSUs		2,052		1.7		3,568		2.3		5,970		2.2
PRSUs		484		1.5		1,751		2.1		3,047		2.5
Total stock-based compensation expense	$	8,921			$	14,278			$	19,217