Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Mar. 31, 2012
Foreign currency forward
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	$ 25	[1]	$ 104	[1]
Derivative Liabilities	0	[1]	(5,725)	[1]
Commodity swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	141	[1]	320	[1]
Derivative Liabilities	0	[1]	(697)	[1]
Fair Value, Measurements, Recurring | Foreign currency forward
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	25		104
Derivative Liabilities			(5,725)
Fair Value, Measurements, Recurring | Commodity swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	141		320
Derivative Liabilities			(697)
Fair Value, Measurements, Recurring | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets			4,078
Fair Value, Measurements, Recurring | Quoted Price in Active Markets for Identical Assets (Level 1) | Foreign currency forward
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0
Derivative Liabilities			0
Fair Value, Measurements, Recurring | Quoted Price in Active Markets for Identical Assets (Level 1) | Commodity swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities			0
Fair Value, Measurements, Recurring | Quoted Price in Active Markets for Identical Assets (Level 1) | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets			0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency forward
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	25		104
Derivative Liabilities			(5,725)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	141		320
Derivative Liabilities			(697)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets			4,078
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign currency forward
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0
Derivative Liabilities			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commodity swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets	0		0
Derivative Liabilities			0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets			$ 0

[1] These financial instruments are required to be measured at fair value, and are based on inputs as described in the three-tier hierarchy that prioritizes inputs used in measuring fair value as of the reported date:•Level 1 – Observable inputs such as quoted prices in active markets for identical assets and liabilities;•Level 2 – Inputs other than quoted prices in active markets that are observable either directly or indirectly; and•Level 3 – Inputs from valuation techniques in which one or more key value drivers are not observable, and must be based on the reporting entity’s own assumptions.