Litigation, Commitments and Contingencies - Narrative (Details) ¥ in Millions												1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended			198 Months Ended
	Oct. 09, 2018 USD ($)	Aug. 16, 2018 USD ($)	Aug. 13, 2018 USD ($)	Jun. 11, 2018 JPY (¥)	Jun. 11, 2018 USD ($)	Oct. 10, 2017 USD ($)	Oct. 03, 2017 USD ($)	Sep. 15, 2017 USD ($)	Mar. 29, 2017 USD ($) employee	Feb. 17, 2017 USD ($)	Apr. 08, 2016 USD ($)	Jan. 31, 2018 USD ($)	Dec. 31, 2012 USD ($)	May 21, 2018	Mar. 31, 2015 USD ($)	Sep. 30, 2018 JPY (¥) lawsuit	Sep. 30, 2018 USD ($) employee lawsuit	May 21, 2021	May 21, 2020	May 21, 2019	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 28, 2017 USD ($)	Dec. 31, 2013 USD ($)
France Copyright Levy
Loss Contingencies [Line Items]
Damages awarded											$ 17,000,000
Copyright levy accrual																	$ 14,400,000							$ 9,500,000
Copyright levy overpaid													$ 55,100,000				55,100,000
ECJ Copyright Levy
Loss Contingencies [Line Items]
Copyright levy payment																					$ 100,000,000
Copyright levy accrual																	5,400,000					$ 5,600,000
Germany Copyright Levy
Loss Contingencies [Line Items]
Copyright levy accrual																	5,100,000
Reversed accrual															$ 2,800,000
IOENGINE Note | Notes Payable, Other Payables
Loss Contingencies [Line Items]
Debt instrument, principal amount																							$ 4,000,000
Repayments of notes payable		$ 2,250,000	$ 2,250,000
Mach 5 B.V. | Imation Europe B.V.
Loss Contingencies [Line Items]
Litigation finance agreement, percentage of legal fees														50.00%
Mach 5 B.V. | Scenario, Forecast | Imation Europe B.V.
Loss Contingencies [Line Items]
Litigation finance agreement, percentage of litigation amounts received																		25.00%	27.50%	30.00%
IOENGINE LLC
Loss Contingencies [Line Items]
Damages awarded										$ 11,000,000
Payments for legal settlements							$ 3,750,000
CMC Magnetic Corp vs. Imation | Imation Corporation Japan
Loss Contingencies [Line Items]
Damages awarded								$ 9,200,000
Payments for legal settlements						$ 1,500,000						$ 500,000
Financing receivable, net						1,500,000
CMC Magnetic Corp vs. Imation | Imation Europe B.V.
Loss Contingencies [Line Items]
Damages awarded						$ 825,000
Suntop Art Work Co., Ltd. vs. Imation | Imation Corporation Japan
Loss Contingencies [Line Items]
Loss contingency, damages sought																¥ 100	900,000
Loss contingency, damages paid				¥ 5	$ 45,000
Severance Action
Loss Contingencies [Line Items]
Loss contingency, damages sought									$ 200,000
Number of employees filing lawsuit | employee									3
Number of employees terminated | employee									100
Severance Action | Imation Europe B.V.
Loss Contingencies [Line Items]
Loss contingency, damages sought																	$ 700,000
Loss contingency, number of new claims filed | lawsuit																4	4
Severance Action | Nexsan Business
Loss Contingencies [Line Items]
Loss contingency, damages sought																	$ 500,000
Number of former executives seeking severance payments | employee																	3
FIAR Case | Imation Europe B.V.
Loss Contingencies [Line Items]
Loss contingency, percentage of plaintiff group																15.00%	15.00%
Loss contingency, damages sought from all plaintiffs																	$ 100,000,000
FIAR Case | Minimum | Imation Europe B.V.
Loss Contingencies [Line Items]
Loss contingency, damages sought																	5,000,000
FIAR Case | Maximum | Imation Europe B.V.
Loss Contingencies [Line Items]
Loss contingency, damages sought																	$ 10,000,000
Subsequent Event | France Copyright Levy
Loss Contingencies [Line Items]
Payment of judgment to be held in trust fund	$ 17,000,000