Stock-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of weighted-average assumptions used to estimate fair value of stock options granted and shares purchased

The fair values of shares purchased under the Employee Stock Purchase Plan (“ESPP”) for the three and six months endedMarch 31, 2012 and April 2, 2011, respectively, were estimated using the following weighted-average assumptions:

	Employee Stock Purchase Plan
	Three Months Ended						Six Months Ended
	March 31, 2012			April 2, 2011			March 31, 2012			April 2, 2011
Expected life in years	0.5			0.5			0.5			0.5
Expected volatility	54.7		%	30.2		%	52.1		%	30.4	%
Risk-free interest rate	0.1		%	0.2		%	0.1		%	0.2	%
Expected dividends	—			—			—			—
Weighted average fair value per share	$	14.70		$	10.06		$	14.81		$9.92

There were no stock options granted during the three and six months endedMarch 31, 2012 and April 2, 2011.

Schedule of weighted average assumptions of performance units

The weighted average fair value for these performance units was $71.59 and was determined using a Monte Carlo simulation model incorporating the following weighted average assumptions:

Risk-free interest rate	0.39	%
Volatility	41.8	%

Schedule of stock-based compensation expense

The following table shows total stock-based compensation expense and related tax benefits included in the condensed consolidated statements of operations for the three and six months endedMarch 31, 2012 and April 2, 2011 (in thousands):

	Three Months Ended						Six Months Ended
	March 31, 2012			April 2, 2011			March 31, 2012			April 2, 2011
Cost of sales	$	441		$	344		$	810		$	588
Research and development	431			363			824			700
Selling, general and administrative	3,288			2,454			6,548			4,796
Income tax benefit	(1,265		)	(849		)	(2,593		)	(1,524		)
	$	2,895		$	2,312		$	5,589		$	4,560

Schedule of stock option activity

The following is a summary of option activity for our Stock Plans (in thousands, except per share amounts and weighted average remaining contractual term in years):

	Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term in Years	Aggregate Intrinsic Value
Outstanding at October 1, 2011	917		$	27.80
Granted	—		—
Exercised	(177	)	27.57
Forfeitures	(1	)	26.16
Expirations	—		—
Outstanding at March 31, 2012	739		$	27.85	4.0	$	22,523
Vested and expected to vest at March 31, 2012	736		$	27.80	3.9	$	22,465
Exercisable at March 31, 2012	554		$	27.53	3.4	$	17,061

Schedule of restricted stock award and restricted stock unit activity

The following table summarizes the activity of our time based and market- performance based restricted stock units for the first six months of fiscal 2012 (in thousands, except per share amounts):

	Time Based Restricted Stock Units				Market-Based Performance Restricted Stock Units
	Number of Shares(1)		Weighted Average Grant Date Fair Value		Number of Shares(2)		Weighted Average Grant Date Fair Value
Nonvested stock at October 1, 2011	404		$	34.71	101		$	49.77
Granted	245		53.78		95		63.85
Vested	(198	)	32.65		(44	)	53.18
Forfeited	(6	)	48.11		—		—
Nonvested stock at March 31, 2012	445		$	47.30	152		$	57.55

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(1)Service-based restricted stock vested during each fiscal year.

(2)Performance-based awards and units included at 100% of target goal; under the terms of the awards, the recipient may earn between 0% and 200% of the award.