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Business Combinations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended
Apr. 29, 2011
Apr. 30, 2010
Apr. 24, 2009
Apr. 29, 2011
Acquisition of Akorri Networks, Inc. [Member]
Severance-Related Charges [Member]
Apr. 29, 2011
Severance-Related Charges [Member]
Apr. 30, 2010
Severance-Related Charges [Member]
Apr. 24, 2009
Severance-Related Charges [Member]
Jan. 31, 2011
Acquisition of Akorri Networks, Inc. [Member]
Apr. 29, 2011
Acquisition of Akorri Networks, Inc. [Member]
May 13, 2010
Bycast Acquisition [Member]
Apr. 29, 2011
Bycast Acquisition [Member]
Apr. 30, 2010
Bycast Acquisition [Member]
Jul. 31, 2009
Termination of Proposed Merger [Member]
Percentage of shares acquired               100.00%   100.00%      
Purchase price cash component               $ 62.3   $ 80.5      
Escrow               7.9   13.1      
Release of escrow funds (in months)               18   18      
Options to purchase shares of common stock assumed in acquisition                   0.2      
Restructuring and other charges 1.8 2.5 54.4 2.4 2.4 0.6 28.0            
Termination fee                         57.0
Incremental third-party costs                         15.9
Acquisition related (income) expense, net $ 5.7 $ (39.9) $ 0           $ 0.6   $ 0.3 $ 1.2 $ (41.1)
Termination of proposed merger with Data Domain, Inc                        

In July 2009, a proposed merger between us and Data Domain, Inc. (Data Domain) was terminated by Data Domain's Board of Directors and, pursuant to the terms of the agreement, Data Domain paid us a $57.0 million termination fee. We incurred $15.9 million of incremental third-party costs relating to the terminated merger transaction during the same period, resulting in a net amount of $41.1 million which is included in acquisition related (income) expense, net in our consolidated statements of operations for the fiscal year ended April 30, 2010.

Business Acquisition, Description of Acquired Entity              

On January 31, 2011, we completed the acquisition of Akorri Networks, Inc., (Akorri) a privately-held company headquartered in Massachusetts. Akorri is a provider of data center management software focused on performance and capacity analytics for virtualized, shared information technology infrastructures. The acquisition extends our offering by adding performance capacity analytics to provide customers greater visibility across the entire IT stack, resulting in further improvement in IT efficiency and flexibility through functions that help control, automate, and analyze their shared IT infrastructure.

 

On May 13, 2010, we completed our acquisition of Bycast Inc. (Bycast), a privately held company headquartered in Vancouver, Canada. Bycast develops and sells software designed to manage petabyte-scale, globally distributed repositories of images, video and records for enterprises and service providers. The acquisition extends our position in unified storage by adding an object-based storage software offering, which simplifies the task of large-scale storage and improves the ability to search and locate data objects.

     
Acquisition date                 January 31, 2011   May 13, 2010