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Acquisitions - Additional Information (Detail)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Mar. 09, 2015
USD ($)
Apr. 01, 2016
USD ($)
May. 31, 2016
$ / shares
May. 09, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jul. 03, 2015
USD ($)
Business Acquisition [Line Items]              
Value allocated to goodwill     $ 2,766.0       $ 2,766.0
Termination fee payable to Sandisk to be paid under agreement $ 1,060.0            
Termination fee payable to Western Digital to be paid under agreement $ 553.3            
SanDisk Merger              
Business Acquisition [Line Items]              
Business Acquisition, Share Price | $ / shares       $ 67.50      
Business Acquisition, Shares       0.2387      
Amplidata [Member]              
Business Acquisition [Line Items]              
Goodwill, Purchase Accounting Adjustments     $ 42.0        
Business Combination, Consideration Transferred   $ 267.0          
Business Acquisition, Cost of Acquired Entity, Cash Paid   245.0          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value   19.0          
Fair value of previously held cost-method investment transferred   3.0          
Value allocated to goodwill   $ 215.0          
Subsequent Event              
Business Acquisition [Line Items]              
Debt Instrument, Face Amount           $ 18,100.0  
New Credit Facilities | Line of Credit | Subsequent Event              
Business Acquisition [Line Items]              
Debt Instrument, Face Amount         $ 10,000.0