Amortizable Intangible Assets and Unamortizable Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 25, 2014		Apr. 27, 2013	Jan. 26, 2013
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 297,326
Accumulated Amortization	(77,699)
Total	219,627
Unamortizable intangible assets, beginning balance	314,736
Impairment	(1,602)	[1]
Unamortizable intangible assets, ending balance	313,134
Total amortizable and unamortizable, intangible assets	532,761		547,931	553,099
Trade name
Intangible Assets by Major Class [Line Items]
Unamortizable intangible assets, beginning balance			293,400
Unamortizable intangible assets, ending balance	293,400		293,400
Publishing contracts
Intangible Assets by Major Class [Line Items]
Unamortizable intangible assets, beginning balance	21,336
Impairment	(1,602)	[1]
Unamortizable intangible assets, ending balance	19,734
Customer relationships and other acquired intangible assets
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	271,938
Accumulated Amortization	(58,414)
Total	213,524
Customer relationships and other acquired intangible assets | Minimum
Intangible Assets by Major Class [Line Items]
Useful Life	5 years
Customer relationships and other acquired intangible assets | Maximum
Intangible Assets by Major Class [Line Items]
Useful Life	25 years
Technology
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	10,710
Accumulated Amortization	(6,272)
Total	4,438
Technology | Minimum
Intangible Assets by Major Class [Line Items]
Useful Life	5 years
Technology | Maximum
Intangible Assets by Major Class [Line Items]
Useful Life	10 years
Distribution contracts
Intangible Assets by Major Class [Line Items]
Useful Life	10 years
Gross Carrying Amount	8,325
Accumulated Amortization	(7,237)
Total	1,088
Other
Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	6,353
Accumulated Amortization	(5,776)
Total	$ 577
Other | Minimum
Intangible Assets by Major Class [Line Items]
Useful Life	1 year
Other | Maximum
Intangible Assets by Major Class [Line Items]
Useful Life	10 years

[1] The Company tests unamortizable intangible assets by comparing the fair value and the carrying value of such assets. During the third quarter of fiscal 2014, the Company completed its annual impairment tests for its other unamortizable intangible assets by comparing the estimated fair value to the carrying value of such assets and determined that one of its publishing contracts has become impaired. As a result, during the third quarter of fiscal 2014, the Company recorded a non-cash impairment charge of $1,602 in selling and administrative expenses.