Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Income Taxes
NOL and capital loss carryforwards	$ 70,320	$ 78,095
Tax credit carryforwards	24,784	25,619
Estimated liabilities	15,925	14,165
Debt repurchase premium	12,711	15,503
Stock-based compensation	6,958	8,127
Deferred revenue	5,898	6,792
Reserves and allowances	4,860	5,805
Other	1,644	2,136
Valuation allowances	(119,424)	(127,418)
Total deferred tax assets	23,676	28,824
Property, plant and equipment basis differences	(20,483)	(26,065)
Goodwill and intangible asset basis differences	(3,193)	(2,759)
Indefinite lived intangible asset basis differences	(4,869)	(3,204)
Total deferred tax liabilities	(28,545)	(32,028)
Net deferred tax liability	$ (4,869)	$ (3,204)

Deferred tax assets pertaining to debt repurchase premium.

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Represents deferred tax asset pertaining to estimated liabilities.

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Amount of deferred tax liability attributable to taxable temporary differences from long-lived assets and liabilities.

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The amount of net operating and capital loss carryforwards available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward available to reduce future tax liability under enacted tax laws.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated returns and sales allowances.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets including goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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