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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 02, 2015
Nov. 20, 2014
Jun. 11, 2014
Mar. 31, 2014
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Dec. 31, 2014
Business Acquisition [Line Items]                  
Amortization of intangible assets         $ 25,917 $ 15,795 $ 52,421 $ 27,536  
Tripwire [Member]                  
Business Acquisition [Line Items]                  
Percentage of outstanding shares acquired 100.00%                
Acquisition price $ 703,200                
Revolving credit agreement 200,000                
Fair value of acquired receivables 37,800                
Acquired receivable, gross contractual amount 38,000                
Amount of acquired receivables not expected to be collected $ 200                
Post acquisition revenues         25,300   44,000    
Post acquisition income (loss) from continuing operations         (16,200)   (44,800)    
Amortization of intangible assets         10,600   22,000    
Impact on reported revenue due to reduction of acquired deferred revenue balance to fair value         14,400   32,700    
Compensation expense             9,200    
Tripwire [Member] | Pro Forma [Member]                  
Business Acquisition [Line Items]                  
Compensation expense               9,200  
Amortization of intangible assets, pro forma disclosure           $ 500   $ 1,900  
Coast Wire and Plastic Tech, LLC [Member]                  
Business Acquisition [Line Items]                  
Percentage of outstanding shares acquired   100.00%              
Acquisition price   $ 36,000              
Prosoft Technology, Inc. [Member]                  
Business Acquisition [Line Items]                  
Percentage of outstanding shares acquired     100.00%            
Acquisition price     $ 104,100            
Fair value of acquired receivables     5,900            
Acquired receivable, gross contractual amount     6,200            
Amount of acquired receivables not expected to be collected     300            
Post acquisition revenues         13,000   25,200    
Post acquisition income (loss) from continuing operations         1,800   4,400    
Amortization of intangible assets         1,000   2,100    
Goodwill acquired     $ 56,900            
Period for deducting goodwill for tax purposes                 15 years
Grass Valley [Member]                  
Business Acquisition [Line Items]                  
Percentage of outstanding shares acquired       100.00%          
Acquisition price       $ 218,200          
Fair value of acquired receivables       67,400          
Acquired receivable, gross contractual amount       77,200          
Amount of acquired receivables not expected to be collected       $ 9,800          
Post acquisition revenues         43,500   94,400    
Post acquisition income (loss) from continuing operations         (13,400)   (22,200)    
Amortization of intangible assets         $ 2,500   $ 5,100