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DESCRIPTION OF BUSINESS - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) patent | Mar. 31, 2021 patent | Mar. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |
Number of new patent portfolios acquired | patent | 0 | 1 |
Maximum |  |  |
Business Acquisition [Line Items] |  |  |
Business Combinations, Ideal Market Value For Future Acquisitions | $ 2,000.0 |  |
Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Business Combinations, Ideal Market Value For Future Acquisitions | $ 1,000.0 |  |
Printronix |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  |  | $ 37.0
Business combination, initial cash payment |  |  | 33.0
Working capital adjustment |  |  | $ 4.0

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