Schedule II - Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 29, 2012	Apr. 27, 2011	Apr. 28, 2010
Allowance for Trade Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Reserves, Balance at beginning of period	$ 10,909	$ 10,196	$ 10,233
Charged to costs and expenses	4,220	1,997	2,158
Deductions	3,807	2,053	2,575
Exchange	(642)	769	380
Valuation Reserves, Balance at end of period	10,680	10,909	10,196
Allowance For Other Receivables [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Reserves, Balance at beginning of period	503	268	1,162
Charged to costs and expenses	108	203	(367)
Deductions	8	0	602
Exchange	4	32	75
Valuation Reserves, Balance at end of period	$ 607	$ 503	$ 268