Stock-based Compensation (Tables)

12 Months Ended

Apr. 30, 2016

Summary of Weighted-Average Assumptions

The fair value of stock options granted was estimated as of the grant date using a Black-Scholes option-pricing model with the following assumptions:

	Fiscal Year Ended
	April 30, 2016			April 25, 2015			April 26, 2014
Expected dividend yield	1.8		%	2.0		%	1.8		%
Expected stock price volatility	25.6		%	26.3		%	30.0		%
Risk-free interest rate	2.1		%	2.1		%	1.5		%
Expected life (years)	6.7			7.0			7.1
Weighted average grant date fair value per share	$	9.66		$	9.78		$	11.02

Summary of Stock Options

The following is a summary of stock option activity:

	Number of Options		Weighted- Average Exercise Price		Aggregate Intrinsic Value
Balance as of April 25, 2015	338		$	36.22
Granted	923		55.39
Exercised	(87	)	36.49
Canceled	(64	)	39.03
Balance as of April 30, 2016	1,110		$	52.09	$	1,402
Vested or expected to vest as of April 30, 2016	1,046		$	52.17	$	1,279
Exercisable as of April 30, 2016	49		$	35.22	$	402

Summary of Non-Vested Restricted Stock Awards and Performance Unit Awards

The following is a summary of restricted stock unit activity:

	Restricted Stock Units
	Shares		Weighted- Average Grant  Date Fair Value
Outstanding at April 25, 2015	122		35.30
Granted	66		44.88
Vested	(6	)	39.54
Forfeitures	(111	)	35.03
Outstanding at April 30, 2016	71		$	44.26

The following is a summary of performance unit award activity at target:

	Performance Unit Awards
	Shares		Weighted- Average Grant Date Fair Value
Outstanding at April 25, 2015	205		$	38.91
Granted	87		54.55
Vested	(78	)	37.70
Forfeitures and cancellations	(57	)	40.69
Outstanding at April 30, 2016	157		$	47.56

The following is a summary of restricted stock award activity:

	Restricted Stock Awards
	Shares		Weighted- Average Grant  Date Fair Value
Outstanding at April 25, 2015	1,168		$	34.39
Granted	191		48.91
Vested	(421	)	33.33
Forfeitures	(178	)	36.34
Outstanding at April 30, 2016	760		$	38.18

Employee Stock Purchase Plan [Member]

Summary of Weighted-Average Assumptions

We estimate the grant date fair value of shares purchased under our ESPP using the Black-Scholes option pricing valuation model with the following weighted average assumptions:

	Fiscal Year Ended
	April 30, 2016			April 25, 2015			April 26, 2014
Expected dividend yield	2.0		%	1.6		%	1.6		%
Expected stock price volatility	21.1		%	31.0		%	31.0		%
Risk-free interest rate	0.5		%	0.1		%	0.2		%
Expected life (years)	0.6			0.5			0.5
Weighted average grant date fair value per share	$	9.16		$	10.74		$	9.46

Capital Accumulation Plan (CAP) [Member]

Summary of Weighted-Average Assumptions

We estimate the grant date fair value of shares purchased under our CAP using the Black-Scholes option pricing valuation model with the following weighted average assumptions:

	Fiscal Year Ended
	April 30, 2016			April 25, 2015			April 26, 2014
Expected dividend yield	2.0		%	1.6		%	1.6		%
Expected stock price volatility	19.7		%	31.0		%	31.0		%
Risk-free interest rate	0.6		%	0.3		%	0.3		%
Expected life (years)	1.0			1.0			1.0
Weighted average grant date fair value per share	$	14.13		$	17.67		$	15.00