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The percentage ownership of a subsidiary.

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Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Recent Transactions and Developments (Details) $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 08, 2026 USD ($)	Mar. 03, 2026 USD ($) patent	Jul. 31, 2026 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Mar. 31, 2026 USD ($)
Discontinued Operations [Line Items]
Litigation settlement, amount awarded from other party	$ 950,000
Litigation settlement, contingent payment receivable		$ 1,300,000
Litigation settlement, number of patents \| patent		4
Litigation settlement receivable				$ 0		$ 0		$ 770,235
Gain on litigation settlement				0	$ 0	392	$ 0
GSL 2018 Equity Incentive Plan
Discontinued Operations [Line Items]
Distribution attributable to equity award holders			$ 186,600
Dividend paid			179,100
Genevant Sciences GmbH
Discontinued Operations [Line Items]
Litigation settlement, fixed payment, percentage		80.00%
Arbutus
Discontinued Operations [Line Items]
Litigation settlement, fixed payment, percentage		20.00%
Arbutus \| GSL 2018 Equity Incentive Plan
Discontinued Operations [Line Items]
Distribution attributable to equity award holders			$ 67,300
Moderna Global Settlement \| GSL 2018 Equity Incentive Plan
Discontinued Operations [Line Items]
Accrued bonuses				22,900		22,900
Genevant Sciences Ltd.
Discontinued Operations [Line Items]
Litigation settlement, fixed payment receivable	$ 771,600
Litigation settlement receivable				$ 1,000		$ 1,000
Genevant Sciences Ltd. \| RSL
Discontinued Operations [Line Items]
Ownership of shares, percentage				83.00%		83.00%
Genevant Sciences Ltd. \| Arbutus
Discontinued Operations [Line Items]
Ownership of shares, percentage				16.00%		16.00%