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Pension and Other Postretirement Benefit Plans 9 (Details) (USD $)
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1 Months Ended |
11 Months Ended |
12 Months Ended |
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Jun. 07, 2013
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Dec. 29, 2013
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Apr. 28, 2013
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Apr. 29, 2012
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Apr. 27, 2011
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| Defined Benefit Plan Disclosure [Line Items] |
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| Accumulated benefit obligation |
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$ 2,960,000,000 |
$ 3,110,000,000 |
$ 2,790,000,000 |
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| Aggregate accumulated benefit obligation |
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338,100,000 |
631,700,000 |
630,300,000 |
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| Aggregate projected benefit obligation |
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339,100,000 |
640,800,000 |
642,300,000 |
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| Aggregate fair value of plan assets |
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312,700,000 |
460,900,000 |
452,900,000 |
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| Aggregate benefit obligation |
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614,700,000 |
900,300,000 |
642,300,000 |
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| Aggregate fair value of plan assets |
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585,500,000 |
720,500,000 |
452,900,000 |
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| Equity securities |
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100.00% |
100.00% |
100.00% |
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| Discretionary company contributions |
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28,300,000 |
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|
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| Estimated future employer contributions in next fiscal year |
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67,000,000 |
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Pension Plan, Defined Benefit [Member]
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| Defined Benefit Plan Disclosure [Line Items] |
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| Special/contractual termination benefits |
17,230,000 |
36,385,000 |
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|
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| Expense associated with accelerated vesting |
(17,230,000) |
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(4,524,000) |
(1,120,000) |
(2,039,000) |
| Change in other comprehensive loss related to postretirement benefit (gains) losses during the period |
79,700,000 |
80,000,000 |
(255,700,000) |
(353,100,000) |
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| Change in other comprehensive loss related to reclassification of postretirement benefit (losses) gains to net income |
(10,700,000) |
(19,500,000) |
(82,900,000) |
(87,300,000) |
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| Company contributions to benefit plans |
6,800,000 |
152,100,000 |
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|
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| Payments for the next fiscal year for claims |
|
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168,604,000 |
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Other Postretirement Benefit Plans, Defined Benefit [Member]
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| Defined Benefit Plan Disclosure [Line Items] |
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| Expense associated with accelerated vesting |
0 |
1,017,000 |
0 |
0 |
0 |
| Change in other comprehensive loss related to postretirement benefit (gains) losses during the period |
6,000,000 |
41,200,000 |
(9,100,000) |
(18,000,000) |
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| Change in other comprehensive loss related to reclassification of postretirement benefit (losses) gains to net income |
400,000 |
(1,000,000) |
4,400,000 |
5,000,000 |
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| Company contributions to benefit plans |
1,400,000 |
8,000,000 |
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|
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| Payments for the next fiscal year for claims |
|
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$ 14,674,000 |
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Minimum [Member]
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| Defined Benefit Plan Disclosure [Line Items] |
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| Weighted-average assumed annual composite rate of increase in the cost of health care |
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6.00% |
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Maximum [Member]
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| Defined Benefit Plan Disclosure [Line Items] |
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| Weighted-average assumed annual composite rate of increase in the cost of health care |
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4.80% |
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Maximum [Member] | Common Stock [Member]
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| Defined Benefit Plan Disclosure [Line Items] |
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| Equity securities |
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1.00% |
1.00% |
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