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Derivative Instruments (Details Textual) (USD $)
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9 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Nov. 30, 2013
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Nov. 30, 2013
Not designated as hedging instruments [Member]
Foreign currency contracts [Member]
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Feb. 28, 2013
Not designated as hedging instruments [Member]
Foreign currency contracts [Member]
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Nov. 30, 2013
Not designated as hedging instruments [Member]
Diesel fuel swap contracts [Member]
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Feb. 28, 2013
Not designated as hedging instruments [Member]
Diesel fuel swap contracts [Member]
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Nov. 30, 2013
Not designated as hedging instruments [Member]
Interest rate swap contracts [Member]
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Feb. 28, 2013
Not designated as hedging instruments [Member]
Interest rate swap contracts [Member]
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Apr. 30, 2012
Not designated as hedging instruments [Member]
Interest rate swap contracts [Member]
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Nov. 30, 2013
Designated as hedging instruments [Member]
Cash flow hedging [Member]
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Nov. 30, 2013
Designated as hedging instruments [Member]
Foreign currency contracts [Member]
Cash flow hedging [Member]
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Feb. 28, 2013
Designated as hedging instruments [Member]
Foreign currency contracts [Member]
Cash flow hedging [Member]
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Nov. 30, 2013
Designated as hedging instruments [Member]
Diesel fuel swap contracts [Member]
Cash flow hedging [Member]
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Feb. 28, 2013
Designated as hedging instruments [Member]
Diesel fuel swap contracts [Member]
Cash flow hedging [Member]
|
Nov. 30, 2013
Designated as hedging instruments [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
|
Feb. 28, 2013
Designated as hedging instruments [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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Apr. 30, 2012
Designated as hedging instruments [Member]
Interest rate swap contracts [Member]
Cash flow hedging [Member]
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| Derivative [Line Items] | ||||||||||||||||
| Maturity of derivative instruments | 12 months | 36 months | ||||||||||||||
| Notional value of derivative instruments | $ 715,900,000 | $ 355,100,000 | $ 36,700,000 | $ 0 | $ 1,000,000,000.0 | $ 1,000,000,000.0 | $ 500,000,000.0 | $ 486,600,000 | $ 220,300,000 | $ 0 | $ 17,400,000 | $ 500,000,000.0 | $ 500,000,000.0 | $ 500,000,000.0 | ||
| Average maturity of cash flow hedges | 3 years | |||||||||||||||
| Maximum maturity of cash flow hedges | 5 years | |||||||||||||||
| Amount of net losses, net of income tax effect, to be reclassified from AOCI to earnings within the next 12 months | (5,500,000) | |||||||||||||||
| Fair value of derivative instruments in a net liability position due to counterparties | 42,700,000 | |||||||||||||||
| Fair value of derivative instruments in a net receivable position due from counterparties | $ 10,300,000 | |||||||||||||||