Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 27, 2011 Site Superfund
Beatrice [Member]
Contingencies (Textual) [Abstract]
Number of sites under environmental matters for which acquired company has a liability	37
Number of sites under environmental matters for which acquired company is making payments	34
Reserves for Beatrice environmental matters	$ 70.7
Maximum period expected for disbursements on environmental matters	19 years
Leases and other commercial obligations guarantee [Member]
Contingencies (Textual) [Abstract]
Guarantee obligation under purchase agreement	12.2
Potato supply agreement guarantee [Member]
Contingencies (Textual) [Abstract]
Amount of supplier loans effectively guaranteed	41.1
Onion supply agreement guarantee [Member]
Contingencies (Textual) [Abstract]
Guarantee obligation under purchase agreement	$ 25.0