Derivative Financial Instruments and Hedging Activities 1 (Details) (USD $) In Thousands	Jul. 27, 2011	Apr. 27, 2011
Foreign Exchange Contract [Member]
Assets:
Total assets	$ 26,644	$ 45,381
Liabilities:
Total liabilities	37,540	36,882
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Assets:
Total assets	24,628	36,052
Liabilities:
Total liabilities	30,936	35,858
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	15,354	28,139
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	9,274	7,913
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	23,946	27,804
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	6,990	8,054
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Assets:
Total assets	2,016	9,329
Liabilities:
Total liabilities	6,604	1,024
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	2,016	9,329
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	0	0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	6,604	1,024
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member]
Assets:
Total assets	42,303	55,426
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Assets:
Total assets	42,303	55,426
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	22,769	38,703
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	19,534	16,723
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	0	0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	0	0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	0	0
Cross Currency Interest Rate Contract [Member]
Assets:
Total assets	34,380	14,898
Liabilities:
Total liabilities	5,778	6,125
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Assets:
Total assets	34,380	14,898
Liabilities:
Total liabilities	5,778	6,125
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	0	0
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	34,380	14,898
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	5,778	6,125
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	0	0
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	0	0
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	0	0
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	0	0
Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	$ 0	$ 0