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Assets and Liabilities Held for Sale and Divested Operations - Narrative (Details) - Discontinued Operations, Disposed of by Sale - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Oct. 01, 2020	Jan. 01, 2020
Derwent Product Line \| Subsequent Event \| Current Assets Held for Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		$ 15,958
Noncurrent assets		20,101
Derwent Product Line \| Subsequent Event \| Current Liabilities Held For Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current liabilities		24,650
Noncurrent liabilities		$ 398
Brand Protection, AntiPiracy, and AntiFraud Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price			$ 3,751
Impairment of finite lived assets	$ 18,431
Impairment of intangible assets	17,967
Goodwill, impairment loss	$ 468