Long-Term Debt - Narrative (Details) $ / shares in Units, $ in Thousands, ₩ in Millions				9 Months Ended
	May 31, 2022	Nov. 04, 2021 USD ($) $ / shares shares	Sep. 24, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 KRW (₩)	Sep. 24, 2021 KRW (₩) tranche
Short-term Debt [Line Items]
Debt issuance costs incurred				$ 66,911	$ 24,082
Proceeds from line of credit				797,091	$ 697,153
Senior Secured Credit Facility | Line of Credit
Short-term Debt [Line Items]
Transaction costs				700
Senior Secured Credit Facility, Base Rate Loans | Line of Credit | Federal Funds Rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.50%
Senior Secured Credit Facility, Base Rate Loans | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.10%
Senior Secured Credit Facility, Base Rate Loans | Line of Credit | London Interbank Offered Rate (LIBOR), Floor Rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.75%
Senior Secured Credit Facility, Base Rate Loans | Line of Credit | London Interbank Offered Rate (LIBOR)
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Senior Secured Credit Facility, Base Rate Loans | Line of Credit | Leverage-Based Margin | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Senior Secured Credit Facility, Base Rate Loans | Line of Credit | Leverage-Based Margin | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	2.75%
Senior Secured Credit Facility, SOFR Loans | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.10%
Senior Secured Credit Facility, SOFR Loans | Line of Credit | London Interbank Offered Rate (LIBOR), Floor Rate
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	0.75%
Senior Secured Credit Facility, SOFR Loans | Line of Credit | Leverage-Based Margin | Minimum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	2.00%
Senior Secured Credit Facility, SOFR Loans | Line of Credit | Leverage-Based Margin | Maximum
Short-term Debt [Line Items]
Basis spread on variable rate (as a percent)	3.75%
Inspire Korea Credit Facility
Short-term Debt [Line Items]
Borrowing capacity						$ 878,500	₩ 1,040,000.0	₩ 1,040,000.0
Number of tranches | tranche								2
Debt instrument, term			48 months
Period after first draw for prepayment			1 year
Undrawn commitment fee (as a percent)			0.30%
Credit enhancement support (up to)			$ 100,000
Debt issuance costs incurred				59,100
Inspire Korea Credit Facility | Tranche A Facility
Short-term Debt [Line Items]
Borrowing capacity						625,100	740,000.0	₩ 740,000.0
Stated interest rate (as a percent)								5.40%
Inspire Korea Credit Facility | Tranche B Facility
Short-term Debt [Line Items]
Borrowing capacity						$ 253,400	₩ 300,000.0	₩ 300,000.0
Stated interest rate (as a percent)								7.00%
Loan interest reserve period (in months)			36 months
MGE Korea Term Loan
Short-term Debt [Line Items]
Debt instrument, term		66 months
Stated interest rate (as a percent)		17.00%
Debt issuance costs incurred				10,000
Proceeds from line of credit		$ 275,000
Fixed charge percentage from share capital and debenture (as a percent)		100.00%
Debt discount		$ 84,800
MGE Korea Warrants And Put Option Liability
Short-term Debt [Line Items]
Debt issuance costs incurred				$ 4,200
Number of warrants (in shares) | shares		4,400
Initial warrant exercise price (in dollars per share) | $ / shares		$ 0.01
Warrants, fully-diluted share capital (as a percent)		22.00%
Aggregate purchase price		$ 110,000
MGE Korea Warrants And Put Option Liability | Warrants And Put Option | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow
Short-term Debt [Line Items]
Warrants, unobservable inputs (as a percent)				0.115
MGE Korea Warrants And Put Option Liability | Warrants And Put Option | Measurement Input, Price Volatility | Valuation Technique, Discounted Cash Flow
Short-term Debt [Line Items]
Warrants, unobservable inputs (as a percent)				0.550
MGE Korea Warrants And Put Option Liability | Put Option
Short-term Debt [Line Items]
Warrants exercisable period (in months)		6 years
MGE Korea Warrants And Put Option Liability | Call Option
Short-term Debt [Line Items]
Warrants exercisable period (in months)		6 months