Long-term Debt - Schedule of Future Contractual Payments of Notes (Detail) $ in Thousands	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
2022	$ 35,585
2023	35,500
2024	35,500
2025	35,500
2026	683,076
Thereafter	1,611,250
Total	2,436,411
Convertible Senior Notes due 2025
Debt Instrument [Line Items]
2022	4,875
2023	4,875
2024	4,875
2025	4,875
2026	652,451
Thereafter	0
Total	671,951
Convertible Senior Notes due 2027
Debt Instrument [Line Items]
2022	0
2023	0
2024	0
2025	0
2026	0
Thereafter	1,050,000
Total	1,050,000
Senior Secured Notes Due Twenty Twenty Eight
Debt Instrument [Line Items]
2022	30,710
2023	30,625
2024	30,625
2025	30,625
2026	30,625
Thereafter	561,250
Total	$ 714,460

- Definition

Amount of long-term debt payable (principal and interest) maturing after fifth fiscal year following current fiscal year.

+ References

No definition available.

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- Definition

Amount of long-term debt payable (principal and interest) maturing in next fiscal year following current fiscal year.

+ References

No definition available.

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- Definition

Amount of long-term debt payable (principal and interest) maturing in fifth fiscal year following current fiscal year.

+ References

No definition available.

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- Definition

Amount of long-term debt payable (principal and interest) maturing in fourth fiscal year following current fiscal year.

+ References

No definition available.

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- Definition

Amount of long-term debt payable (principal and interest) maturing in third fiscal year following current fiscal year.

+ References

No definition available.

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- Definition

Amount of long-term debt payable (principal and interest) maturing in second fiscal year following current fiscal year.

+ References

No definition available.

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- Definition

Total future payments on long-term debt.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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