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New Accounting Pronouncements and Changes in Accounting (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Oct. 01, 2020	Sep. 30, 2020	Oct. 01, 2019
New Accounting Pronouncements and Changes in Accounting
(Accumulated deficits) Retained earnings	$ (483,362)		$ 174,248
ASU 2016-02
New Accounting Pronouncements and Changes in Accounting
(Accumulated deficits) Retained earnings				$ (87,800)
ASU 2016-06
New Accounting Pronouncements and Changes in Accounting
(Accumulated deficits) Retained earnings		$ (8,000)

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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-Topic 210
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