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Stock Purchase and Award Plans (Tables)
 12 Months Ended
Apr. 26, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options Valuation Assumptions
 
Fiscal Year
 
2013
 
2012
 
2011
Weighted average fair value of options granted
$
7.42

 
$
6.88

 
$
8.19

Assumptions used:
 

 
 

 
 

Expected life (years)(a)
6.50

 
6.40

 
6.30

Risk-free interest rate(b)
0.94
%
 
1.82
%
 
2.25
%
Volatility(c)
26.22
%
 
25.97
%
 
26.03
%
Dividend yield(d)
2.64
%
 
2.78
%
 
2.40
%

(a)
Expected life: The Company analyzes historical employee stock option exercise and termination data to estimate the expected life assumption. The Company calculates the expected life assumption using the midpoint scenario, which combines historical exercise data with hypothetical exercise data, as the Company believes this data currently represents the best estimate of the expected life of a new employee option. The Company also stratifies its employee population into two groups based upon distinctive exercise behavior patterns.
(b)
Risk-free interest rate: The rate is based on the grant date yield of a zero-coupon U.S. Treasury bond whose maturity period equals the expected term of the option.
(c)
Volatility: Expected volatility is based on a blend of historical volatility and an implied volatility of the Company’s common stock. Implied volatility is based on market traded options of the Company’s common stock.
(d)
Dividend yield: The dividend yield rate is calculated by dividing the Company’s annual dividend, based on the most recent quarterly dividend rate, by the closing stock price on the grant date.
Schedule of Share-based Compensation Expense by Plan
 
Fiscal Year
(in millions)
2013
 
2012
 
2011
Stock options
$
44

 
$
60

 
$
87

Restricted stock awards
96

 
86

 
97

Employee stock purchase plan
12

 
13

 
14

Physio-Control award acceleration
—

 
2

 
—

Total stock-based compensation expense
$
152

 
$
161

 
$
198

Cost of products sold
$
12

 
$
12

 
$
22

Research and development expense
31

 
29

 
49

Selling, general, and administrative expense
109

 
118

 
127

Physio-Control divestiture-related costs
—

 
2

 
—

Total stock-based compensation expense
152

 
161

 
198

Income tax benefits
(43
)
 
(45
)
 
(58
)
Total stock-based compensation expense, net of tax
$
109

 
$
116

 
$
140
Schedule of Stock Options Activity
 
Fiscal Year
 
2013
 
2012
 
2011
 
Options (in
thousands)
 
Wtd. Avg.
Exercise
Price
 
Options (in
thousands)
 
Wtd. Avg.
Exercise
Price
 
Options (in
thousands)
 
Wtd. Avg.
Exercise
Price
Beginning balance
74,590

 
$
44.80

 
84,652

 
$
45.23

 
89,613

 
$
46.13

Granted
4,437

 
39.54

 
4,634

 
34.93

 
6,371

 
37.59

Exercised
(6,096
)
 
37.73

 
(1,218
)
 
34.95

 
(627
)
 
32.84

Canceled
(10,911
)
 
45.57

 
(13,478
)
 
44.98

 
(10,705
)
 
48.91

Outstanding at year-end
62,020

 
$
44.98

 
74,590

 
$
44.80

 
84,652

 
$
45.23

Exercisable at year-end
50,908

 
$
46.65

 
60,833

 
$
46.73

 
66,286

 
$
47.24
Schedule of Restricted Stock Award Activity
 
Fiscal Year
 
2013
 
2012
 
2011
 
Awards (in
thousands)
 
Wtd. Avg.
Grant
Price
 
Awards (in
thousands)
 
Wtd. Avg.
Grant
Price
 
Awards (in
thousands)
 
Wtd. Avg.
Grant
Price
Nonvested, beginning balance
9,980

 
$
37.80

 
9,207

 
$
40.42

 
8,909

 
$
42.67

Granted
3,135

 
39.53

 
3,785

 
35.60

 
2,682

 
37.52

Vested
(2,445
)
 
35.58

 
(2,194
)
 
44.74

 
(1,809
)
 
47.28

Forfeited
(612
)
 
36.34

 
(818
)
 
38.46

 
(575
)
 
40.12

Nonvested at year-end
10,058

 
$
38.97

 
9,980

 
$
37.80

 
9,207

 
$
40.42