Fair Value Measurements (Details) (USD $)	3 Months Ended
	Jul. 27, 2011	Apr. 27, 2011
Fair Value Measurements (Textuals) [Abstract]
Interest rate on notes issued	7.125%	7.125%
Recognized non-cash asset write-offs	$ 16,800,000
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Derivatives	0	0
Short-term investments	57,165,000	60,125,000
Total assets at fair value	57,165,000	60,125,000
Liabilities:
Derivatives	0	0
Earn-out	0	0
Total liabilities at fair value	0	0
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Derivatives	103,327,000	115,705,000
Short-term investments	0	0
Total assets at fair value	103,327,000	115,705,000
Liabilities:
Derivatives	43,318,000	43,007,000
Earn-out	0	0
Total liabilities at fair value	43,318,000	43,007,000
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Derivatives	0	0
Short-term investments	0	0
Total assets at fair value	0	0
Liabilities:
Derivatives	0	0
Earn-out	45,714,000	45,325,000
Total liabilities at fair value	45,714,000	45,325,000
Fair Value, Measurements, Recurring [Member]
Assets:
Derivatives	103,327,000	115,705,000
Short-term investments	57,165,000	60,125,000
Total assets at fair value	160,492,000	175,830,000
Liabilities:
Derivatives	43,318,000	43,007,000
Earn-out	45,714,000	45,325,000
Total liabilities at fair value	$ 89,032,000	$ 88,332,000