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Income Taxes (Narrative) (Details) | 3 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | ---
Jan. 03, 2015 USD ($) | Sep. 30, 2016 USD ($) foreign_subsidiary | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) foreign_subsidiary | Sep. 30, 2015 USD ($) | Sep. 30, 2013 USD ($)
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  | (19.00%) |  | (79.00%) |  | 14.00% |  |  |
Income before income taxes |  |  | $ (67,192,000) |  | $ 26,525,000 |  | $ 186,112,000 |  |  |
Statutory federal income tax rate |  |  | (35.00%) |  | 35.00% |  | 35.00% |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  |  | $ (28,000,000) |  | $ (24,000,000) |  |  |  |  |
Decrease of valuation allowance in foreign jurisdictions |  |  | 3,100,000 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount |  |  |  |  | 14,500,000 |  |  |  |  |
Pension valuation allowance |  |  |  |  | (18,700,000) |  |  |  |  |
Deferred Other Tax Expense (Benefit) |  |  |  |  | (1,400,000) |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  | $ 2,100,000 | 6,000,000 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Amount |  |  |  |  | 3,800,000 |  | $ 5,100,000 |  |  |
Other Tax Expense (Benefit) |  |  |  |  | 3,100,000 |  |  |  |  |
Change in foreign income tax withholding valuation allowance |  |  | $ 600,000 |  | 0 |  | $ 3,500,000 |  |  |
Number of foreign subsidiaries included in valuation allowance | foreign_subsidiary |  |  | 2 |  |  |  | 2 |  |  |
Prepaid income taxes |  |  | $ 9,900,000 |  | 8,200,000 |  |  | $ 8,200,000 |  |
Income taxes payable |  |  | 18,700,000 |  | 14,700,000 |  |  | 14,700,000 |  |
Accrued income taxes |  |  | 6,300,000 |  | 4,000,000 |  |  | 4,000,000 |  |
Other current liabilities |  |  | 5,500,000 |  | 2,200,000 |  |  | 2,200,000 |  |
Other liabilities |  |  | 6,900,000 |  | 8,500,000 |  |  | 8,500,000 |  |
Income tax payments |  |  | 25,500,000 |  | 30,100,000 |  | $ 25,500,000 |  |  |
Net deferred tax assets | [1] |  | 75,942,000 |  | 31,756,000 |  |  | 31,756,000 |  |
Net operating loss related to windfall tax deductions |  |  | 45,100,000 |  |  |  |  |  |  |
Valuation allowance |  |  | 235,503,000 | [1] | 198,168,000 | [1] | 177,500,000 | 198,168,000 | [1] | $ 156,500,000
Interest expense |  |  | 500,000 |  | 100,000 |  | 300,000 |  |  |
Penalty expense |  |  | 0 |  | 0 |  | 0 |  |  |
Interest expense related to income tax accruals |  |  | 2,000,000 |  | 1,500,000 |  |  | 1,500,000 |  |
Accrued tax penalties |  |  | 0 |  | 0 |  | 0 | 0 |  |
Unrecognized tax benefit |  |  | 15,500,000 |  | 14,100,000 |  | 15,000,000 | 14,100,000 |  | $ 13,700,000
Income tax provision upon recognition of unrecognized tax benefit |  |  | (13,900,000) |  |  |  |  |  |  |
Unrecognized tax benefits, increase in valuation allowance upon recognition |  |  | 4,800,000 |  |  |  |  |  |  |
Unrecognized tax benefits, increase to additional paid-in capital upon recognition |  |  | 1,600,000 |  |  |  |  |  |  |
Potential decrease in unrecognized tax benefits |  |  | 8,000,000 |  |  |  |  |  |  |
Stock-based compensation |  |  | 65,996,000 |  | 50,182,000 |  | 50,889,000 |  |  |
Tax benefit recognition related to stock based compensation |  |  | 700,000 |  | 700,000 |  | 700,000 |  |  |
Increase (decrease) in income taxes payable |  |  | (6,749,000) |  | 3,536,000 |  | (19,134,000) |  |  |
Expected deferred tax expense |  |  | 12,000,000 |  |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries |  |  | 789,000,000 |  | 684,000,000 |  |  | 684,000,000 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | [1] |  | 18,041,000 |  | 15,962,000 |  |  | $ 15,962,000 |  |
R&D credit related to windfall tax deductions |  |  | 14,000,000 |  |  |  |  |  |  |
Domestic Country [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 247,100,000 |  |  |  |  |  |  |
Valuation allowance |  |  | 209,000,000 |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  |  | 18,000,000 |  |  |  |  |  |  |
Domestic Country [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Credit carryforwards |  |  | 25,200,000 |  |  |  |  |  |  |
State - Massachusetts [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Credit carryforwards |  |  | 24,800,000 |  |  |  |  |  |  |
Foreign Country [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 102,400,000 |  |  |  |  |  |  |
Valuation allowance |  |  | 26,500,000 |  |  |  |  |  |  |
Credit carryforwards |  |  | $ 7,500,000 |  |  |  |  |  |  |
Korea |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Description |  |  | 12 |  |  |  |  | 12 |  |
Windfall Tax Benefit [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in income taxes payable |  |  | $ 100,000 |  | $ 0 |  | 10,400,000 |  |  |
Windfall tax deductions not yet recognized |  |  | 33,400,000 |  |  |  |  |  |  |
2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred tax assets, change in valuation allowance |  |  |  |  |  |  | (18,100,000) |  |  |
Deferred Tax Liabilities, Net |  |  |  |  |  |  | $ 21,600,000 |  |  |
All Acquisitions [Member] | Domestic Country [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | $ 82,200,000 |  |  |  |  |  |  |
[1] | (1) See Note B. Recent Accounting Pronouncements-Deferred Taxes regarding a change in the balance sheet classification of our deferred taxes.

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