Derivative Financial Instruments and Hedging Activities 1 (Details) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2012	Apr. 27, 2011
Foreign Exchange Contract [Member]
Assets:
Total assets	$ 25,249	$ 45,381
Liabilities:
Total liabilities	15,575	36,882
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Assets:
Total assets	24,679	36,052
Liabilities:
Total liabilities	9,267	35,858
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	18,392	28,139
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	6,287	7,913
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	8,801	27,804
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Liabilities:
Total liabilities	466	8,054
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Assets:
Total assets	570	9,329
Liabilities:
Total liabilities	6,308	1,024
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	570	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	6,308	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	40,703	55,426
Liabilities:
Total liabilities	739	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Assets:
Total assets	40,703	55,426
Liabilities:
Total liabilities	0	0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	10,260	38,703
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	30,443	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	739	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	739	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	34,509	14,898
Liabilities:
Total liabilities	2,666	6,125
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Assets:
Total assets	34,509	14,898
Liabilities:
Total liabilities	2,666	6,125
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Receivables, Net [Member]
Assets:
Total assets	23,717	0
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Non-Current Assets [Member]
Assets:
Total assets	10,792	14,898
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Other Payables [Member]
Liabilities:
Total liabilities	2,666	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