Derivative Financial Instruments and Hedging Activities 2 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 28, 2012	Oct. 26, 2011	Oct. 28, 2012	Oct. 26, 2011
Foreign Exchange Contract [Member]
Cash flow hedges:
Net gains recognized in other comprehensive loss (effective portion)	$ 7,184	$ 10,945	$ 12,360	$ 18,331
Net gains/(losses) reclassified from other comprehensive loss into earnings (effective portion):
Sales	2,439	1,989	4,184	4,093
Cost of products sold	(3,920)	(4,216)	(5,288)	(9,804)
Selling, general and administrative expenses	31	(18)	(117)	105
Other (expense)/income, net	1,259	2,853	8,559	8,003
Interest income/(expense)	(70)	74	(120)	181
Total	(261)	682	7,218	2,578
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	564	4,794	(1,111)	(4,069)
Total amount recognized in statement of income	303	5,476	6,107	(1,491)
Interest Rate Contract [Member]
Cash flow hedges:
Net gains recognized in other comprehensive loss (effective portion)	0	(2,341)	0	(2,341)
Net gains/(losses) reclassified from other comprehensive loss into earnings (effective portion):
Sales	0	0	0	0
Cost of products sold	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Other (expense)/income, net	0	0	0	0
Interest income/(expense)	(59)	(29)	(118)	(29)
Total	(59)	(29)	(118)	(29)
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	297	0	490	0
Total amount recognized in statement of income	(3,662)	2,484	1,106	(10,639)
Cross Currency Interest Rate Contract [Member]
Cash flow hedges:
Net gains recognized in other comprehensive loss (effective portion)	(6,798)	9,300	(1,675)	27,629
Net gains/(losses) reclassified from other comprehensive loss into earnings (effective portion):
Sales	0	0	0	0
Cost of products sold	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Other (expense)/income, net	(5,908)	9,398	3,009	29,662
Interest income/(expense)	(1,215)	(1,437)	(2,667)	(2,943)
Total	(7,123)	7,961	342	26,719
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	0	0	0	0
Total amount recognized in statement of income	(7,123)	7,961	342	26,719
Other Expense [Member] | Foreign Exchange Contract [Member]
Fair value hedges:
Net gains/(losses) recognized in other (expense)/income, net	0	0	0	0
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	564	4,794	(1,111)	(4,069)
Other Expense [Member] | Interest Rate Contract [Member]
Fair value hedges:
Net gains/(losses) recognized in other (expense)/income, net	(3,900)	2,513	734	(10,610)
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	0	0	0	0
Other Expense [Member] | Cross Currency Interest Rate Contract [Member]
Fair value hedges:
Net gains/(losses) recognized in other (expense)/income, net	0	0	0	0
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	0	0	0	0
Interest Income [Member] | Foreign Exchange Contract [Member]
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	0	0	0	0
Interest Income [Member] | Interest Rate Contract [Member]
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	297	0	490	0
Interest Income [Member] | Cross Currency Interest Rate Contract [Member]
Derivatives not designated as hedging instruments:
Net gains/(losses) recognized in other expense, net	$ 0	$ 0	$ 0	$ 0