Changes In Intangible Assets And Goodwill (Amortizable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 29, 2011
Finite-Lived Intangible Assets [Line Items]
Useful Life, years	3
Gross Carrying Amount	$ 310,713
Accumulated Amortization	(50,485)
Total	260,228
Customer Relationships And Other Acquired Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life minimum, years	3
Useful Life maximum, years	25
Gross Carrying Amount	271,938
Accumulated Amortization	(23,514)
Total	248,424
Author Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life, years	10
Gross Carrying Amount	18,461
Accumulated Amortization	(16,127)
Total	2,334
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life minimum, years	5
Useful Life maximum, years	10
Gross Carrying Amount	5,850
Accumulated Amortization	(2,025)
Total	3,825
Distribution Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life, years	10
Gross Carrying Amount	8,325
Accumulated Amortization	(4,618)
Total	3,707
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life minimum, years	3
Useful Life maximum, years	10
Gross Carrying Amount	6,139
Accumulated Amortization	(4,201)
Total	$ 1,938