Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2014	Sep. 30, 2014
Assets (Liabilties) at Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets (liabilities) at fair value	$ 7,745	$ 18,972
Assets (Liabilties) at Fair Value \| Other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded assets	10,070	18,972
Assets (Liabilties) at Fair Value \| Other current assets \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets	10,215
Gross amounts offset in the balance sheets	(145)
Assets (Liabilties) at Fair Value \| Other current assets \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets		22,593
Gross amounts offset in the balance sheets		(750)
Assets (Liabilties) at Fair Value \| Other current assets \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets		(3,373)
Assets (Liabilties) at Fair Value \| Other current assets \| Derivatives not designated as hedging instruments \| 30-day euro forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets		502
Assets (Liabilties) at Fair Value \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded liabilities	2,325
Assets (Liabilties) at Fair Value \| Accrued liabilities \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets	(14,103)
Gross amounts of recognized liabilities	438
Assets (Liabilties) at Fair Value \| Accrued liabilities \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets	15,990
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets (liabilities) at fair value	7,745	18,972
Level 2 \| Other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded assets	10,070	18,972
Level 2 \| Other current assets \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets	10,215
Gross amounts offset in the balance sheets	(145)
Level 2 \| Other current assets \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets		22,593
Gross amounts offset in the balance sheets		(750)
Level 2 \| Other current assets \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets		(3,373)
Level 2 \| Other current assets \| Derivatives not designated as hedging instruments \| 30-day euro forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts of recognized assets		$ 502
Level 2 \| Accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net amount of recorded liabilities	(2,325)
Level 2 \| Accrued liabilities \| Designated as cash flow hedges \| Currency hedge portfolio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets	(14,103)
Gross amounts of recognized liabilities	438
Level 2 \| Accrued liabilities \| Designated as cash flow hedges \| Bunker fuel forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross amounts offset in the balance sheets	$ 15,990