Debt - Narrative (Details) - Senior secured debt	Aug. 31, 2020 USD ($)
Sixth Street Financing Agreement
Liability For Sale of Future Royalties [Line Items]
Credit facility capacity	$ 500,000,000
Sixth Street Financing - term loan
Liability For Sale of Future Royalties [Line Items]
Principal amount	275,000,000
Sixth Street Financing - delayed draw term loans
Liability For Sale of Future Royalties [Line Items]
Principal amount	$ 225,000,000

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant