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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 03, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  | $ (27,932) | $ (27,513) | $ (56,375) |
Decrease of valuation allowance in foreign jurisdictions |  | (9,000) | (3,100) |  |
Effective Income Tax Rate Reconciliation, Resolution of Uncertain Tax Positions, Amount |  | (3,840) | 0 | (2,991) |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Amount |  | 2,737 | 1,987 | 3,764 |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | $ 2,100 | 2,182 | 5,981 | 2,097 |
Tax permanent items related to pending legal settlement |  |  |  | 14,500 |
Pension valuation allowance |  |  |  | (18,700) |
Other Tax Expense (Benefit) |  |  |  | 3,100 |
Deferred Other Tax Expense (Benefit) |  |  |  | (1,400) |
Income taxes payable |  | 16,200 | 18,700 |  |
Accrued income taxes |  | 5,700 | 6,300 |  |
Other current liabilities |  | 2,300 | 5,500 |  |
Prepaid income taxes |  | 7,100 | 9,900 |  |
Other liabilities |  | 8,200 | 6,900 |  |
Income tax payments |  | 35,400 | 25,500 | 30,100 |
Net operating loss related to windfall tax deductions |  | 61,400 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 21,099 | 18,041 |  |
R&D credit related to windfall tax deductions |  | 13,400 |  |  |
Gross Deferred Interest Carryforward |  | 93,300 |  |  |
Gross Deferred Amortization Carryforward |  | 535,600 |  |  |
Valuation allowance |  | 279,683 | 235,503 | 198,200 | $ 177,500
Interest expense |  | 900 | 500 | 100 |
Penalty expense |  | 0 | 0 | 0 |
Interest expense related to income tax accruals |  | 1,100 | 2,000 |  |
Accrued tax penalties |  | 0 | 0 | 0 |
Unrecognized tax benefit |  | 14,800 | 15,500 | 14,100 | $ 15,000
Income tax provision upon recognition of unrecognized tax benefit |  | 14,800 |  |  |
Unrecognized tax benefits, increase in valuation allowance upon recognition |  | 5,100 |  |  |
Potential decrease in unrecognized tax benefits |  | 6,000 |  |  |
Stock-based compensation |  | 76,708 | 65,996 | 50,182 |
Tax benefit recognition related to stock based compensation |  | 1,300 | 700 | 700 |
Increase (decrease) in income taxes payable |  | 798 | (6,749) | 3,536 |
Deferred Tax Liability Not Recognized, Description of Temporary Difference, Undistributed Earnings of Foreign Subsidiaries |  | (11,440) | (67) |  |
Expected deferred tax expense |  | 12,000 |  |  |
Undistributed Earnings of Foreign Subsidiaries |  | 882,000 | 789,000 |  |
realignment [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  | (28,000) | (28,000) | (24,000) |
foreign jurisdiction [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Resolution of Uncertain Tax Positions, Amount |  | (3,500) |  |  |
Domestic Country [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 383,000 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  | 20,800 |  |  |
Valuation allowance |  | 239,300 |  |  |
Domestic Country [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Credit carryforwards |  | 27,400 |  |  |
State - Massachusetts [Member] | Research Tax Credit Carryforward [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Credit carryforwards |  | 23,500 |  |  |
Foreign Country [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 90,200 |  |  |
Credit carryforwards |  | 5,400 |  |  |
Valuation allowance |  | 40,400 |  |  |
Korea |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  | 12,000 |  |  |
Windfall Tax Benefit [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Increase (decrease) in income taxes payable |  | 600 | 100 | $ 0 |
Windfall tax deductions not yet recognized |  | 38,300 |  |  |
All Acquisitions [Member] | Domestic Country [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 82,200 |  |  |
Patents [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Amount |  | $ 2,000 | $ 2,000 |  |

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