Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Feb. 08, 2018	Dec. 31, 2017	May 31, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	$ 1,569,970		$ 1,478,257
Snell Advanced Media
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Receivables		$ 19,900
Inventory		17,605
Prepaid and other current assets		2,339
Property, plant, and equipment		9,212
Intangible assets		44,750
Goodwill		92,263
Deferred taxes		5,476
Other long-lived assets		4,306
Total assets acquired		195,851
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Accounts payable		11,927
Accrued liabilities		17,960
Deferred revenue		4,000
Long-term debt		19,305
Postretirement benefits		49,131
Other long-term liabilities		591
Total liabilities assumed		102,914
Net assets		$ 92,937
Thinklogical Holdings LLC
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Receivables				$ 4,355
Inventory				16,424
Prepaid and other current assets				320
Property, plant, and equipment				4,289
Intangible assets				73,400
Goodwill				71,252
Total assets acquired				170,040
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Accounts payable				1,231
Accrued liabilities				1,353
Deferred revenue				1,702
Total liabilities assumed				4,286
Net assets				$ 165,754