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Business Combinations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended 12 Months Ended
Apr. 26, 2013
Feb. 11, 2013
ionGrid
Nov. 14, 2012
CacheIQ
Apr. 26, 2013
Fiscal 2013 Acquisitions
Nov. 30, 2012
Fiscal 2013 Acquisitions
Maximum
Feb. 28, 2013
Fiscal 2013 Acquisitions
Minimum
Apr. 27, 2012
Fiscal 2012 Acquisition
May 06, 2011
Fiscal 2012 Acquisition
Apr. 27, 2012
Fiscal 2012 Acquisition
Adjustment from Step-up in Inventory
Apr. 29, 2011
Fiscal 2012 Acquisition
Adjustment from Step-up in Inventory
Apr. 29, 2011
Fiscal 2011 Acquisitions
Business Acquisition [Line Items]                      
Business acquisition cash paid $ 106.9 $ 17.1           $ 480.0      
Business acquisition, cash and equity paid 108.1   91.0 108.1       480.0     146.1
Finite-Lived intangible asset, useful life         5 years 3 years          
Business acquisition purchase price allocation warranty receivable               13.0      
Net revenues             665.9        
Adjustment reflected in unaudited pro forma condensed combined information                 5.6 (5.6)  
Business acquisition, tangible net assets                     21.2
Business acquisition, finite-lived intangible assets       30.3       272.1     45.6
Business acquisition, goodwill       $ 82.9       $ 143.7     $ 80.5