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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Jun. 28, 2015 | Jan. 02, 2015 | Dec. 31, 2014 | Jun. 11, 2014 | Mar. 31, 2014
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,418,031 |  | $ 943,374 |  |
Tripwire [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | $ 2,364 |  |  |
Receivables |  | 37,792 |  |  |
Inventories |  | 603 |  |  |
Other current assets |  | 2,822 |  |  |
Property, plant and equipment |  | 11,113 |  |  |
Goodwill |  | 477,609 |  |  |
Intangible assets |  | 306,000 |  |  |
Other non-current assets |  | 658 |  |  |
Total assets |  | 838,961 |  |  |
Accounts payable |  | 3,142 |  |  |
Accrued liabilities |  | 11,548 |  |  |
Deferred revenue |  | 8,000 |  |  |
Deferred income taxes |  | 112,522 |  |  |
Other non-current liabilities |  | 540 |  |  |
Total liabilities |  | 135,752 |  |  |
Net assets |  | $ 703,209 |  |  |
Grass Valley [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  |  |  |  | $ 9,451
Receivables |  |  |  |  | 67,354
Inventories |  |  |  |  | 18,593
Other current assets |  |  |  |  | 4,172
Property, plant and equipment |  |  |  |  | 22,460
Goodwill |  |  |  |  | 131,070
Intangible assets |  |  |  |  | 95,500
Other non-current assets |  |  |  |  | 17,101
Total assets |  |  |  |  | 365,701
Accounts payable |  |  |  |  | 51,276
Accrued liabilities |  |  |  |  | 62,672
Deferred revenue |  |  |  |  | 14,000
Postretirement benefits |  |  |  |  | 16,538
Deferred income taxes |  |  |  |  | 1,827
Other non-current liabilities |  |  |  |  | 1,199
Total liabilities |  |  |  |  | 147,512
Net assets |  |  |  |  | $ 218,189
Prosoft Technology, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  |  |  | $ 2,517 |
Receivables |  |  |  | 5,894 |
Inventories |  |  |  | 2,731 |
Other current assets |  |  |  | 332 |
Property, plant and equipment |  |  |  | 767 |
Goodwill |  |  |  | 56,923 |
Intangible assets |  |  |  | 40,800 |
Other non-current assets |  |  |  | 622 |
Total assets |  |  |  | 110,586 |
Accounts payable |  |  |  | 2,544 |
Accrued liabilities |  |  |  | 2,807 |
Other non-current liabilities |  |  |  | 1,132 |
Total liabilities |  |  |  | 6,483 |
Net assets |  |  |  | $ 104,103 |

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