Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jul. 31, 2012
Fair value of derivatives in a gain position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Other Current Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	$ 9.3
Fair value of derivatives in a gain position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Other Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	2.3
Fair value of derivatives in a gain position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Accrued Expenses [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	2.4
Fair value of derivatives in a gain position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	1.0
Fair value of derivatives in a gain position [Member] | Currency derivatives [Member] | Not designated as hedges [Member] | Accrued Expenses [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position
Fair value of derivatives in a gain position [Member] | Interest rate swaps [Member] | Fair Value Hedging [Member] | Other Current Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	0.5
Fair value of derivatives in a gain position [Member] | Interest rate swaps [Member] | Fair Value Hedging [Member] | Other Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	1.7
Fair value of derivatives in a loss position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Other Current Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	(3.3)
Fair value of derivatives in a loss position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Other Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	(0.3)
Fair value of derivatives in a loss position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Accrued Expenses [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	(2.6)
Fair value of derivatives in a loss position [Member] | Currency derivatives [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	(1.7)
Fair value of derivatives in a loss position [Member] | Currency derivatives [Member] | Not designated as hedges [Member] | Accrued Expenses [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position	(3.8)
Fair value of derivatives in a loss position [Member] | Interest rate swaps [Member] | Fair Value Hedging [Member] | Other Current Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position
Fair value of derivatives in a loss position [Member] | Interest rate swaps [Member] | Fair Value Hedging [Member] | Other Assets [Member]
Fair values of derivative instruments
Fair value of derivatives in a gain (loss) position