Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Expense (benefit) from income taxes	$ 4,981	$ (2,180)	$ 8,940	$ (44,260)
Tax credit			800	9,800
Inventory impairments and abandonments	$ 2,266	$ 0	$ 2,266	$ 148,618
Deferred tax assets, tax credit carryforwards					$ 4,600	$ 4,600

Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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