Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 56,128us-gaap_NetIncomeLoss	$ (2,054)us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation, amortization, and accretion expense	1,234	2,068
Stock-based compensation expense	2,608us-gaap_ShareBasedCompensation	1,135us-gaap_ShareBasedCompensation
Deferred income taxes	24,080us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of Photovoltaics Business	(87,022)us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness
Gain on sale of an investment	0us-gaap_GainLossOnInvestments	(290)us-gaap_GainLossOnInvestments
Provision adjustments related to doubtful accounts	290	(35)
Provision adjustments related to product warranty	402us-gaap_ProductWarrantyExpense	265us-gaap_ProductWarrantyExpense
Change in fair value of financial instruments	(36)us-gaap_UnrealizedGainLossOnDerivatives	78us-gaap_UnrealizedGainLossOnDerivatives
Gain from change in estimate on ARO obligation	(845)	0
Reclassification of foreign currency translation adjustment	744	0
Net loss on disposal of equipment	(237)us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Total non-cash adjustments	(59,796)	3,221
Changes in operating assets and liabilities:
Accounts receivable	5,334	5,950
Inventory	(2,188)us-gaap_IncreaseDecreaseInInventories	135us-gaap_IncreaseDecreaseInInventories
Other assets	(4,066)	981
Accounts payable	(374)	(1,652)
Accrued expenses and other current liabilities	7,711	144
Total change in operating assets and liabilities	6,417	5,558
Net cash provided by operating activities	2,749	6,725
Cash flows from investing activities:
Proceeds from sale of Photovoltaics Business	150,000	0
Cash proceeds from sale of investment	0us-gaap_GainLossOnSaleOfInvestments	290us-gaap_GainLossOnSaleOfInvestments
Purchase of equipment	(845)	(684)
Decrease in restricted cash	1,075	262
Proceeds from disposal of property, plant and equipment	50	0
Net cash provided by (used in) investing activities	150,280	(132)
Cash flows from financing activities:
Payments on credit facilities	(26,518)	(4,506)
Proceeds from stock plans	355us-gaap_ProceedsFromStockPlans	14us-gaap_ProceedsFromStockPlans
Net cash used in financing activities	(26,163)	(4,492)
Effect of exchange rate changes on foreign currency	23	(61)
Net increase in cash and cash equivalents	126,889	2,040
Cash and cash equivalents at beginning of period	20,687	16,104
Cash and cash equivalents at end of period	147,576	18,144
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	94us-gaap_InterestPaid	112us-gaap_InterestPaid
Cash paid during the period for income taxes	$ 25us-gaap_IncomeTaxesPaid	$ 0us-gaap_IncomeTaxesPaid

Asset Retirement Obligation, Gain (Loss) from Revision of Estimates

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Foreign Currency Transaction Gain (Loss) Reclassified to Earnings

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Amount of increase (decrease) in the allowance for doubtful accounts.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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