Derivatives - Additional Information (Details) oz in Thousands, $ in Millions	3 Months Ended
	Oct. 31, 2015 USD ($) oz	Jan. 31, 2015 USD ($) oz	Nov. 01, 2014 USD ($) oz
Interest rate swaps
Derivative [Line Items]
Derivative, notional amount	$ 300.0
Foreign currency contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, notional amount	35.5	$ 40.3	$ 58.4
Cash Flow Hedging
Derivative [Line Items]
Cash flow hedge loss to be reclassified within twelve months	(5.7)
Cash Flow Hedging | Foreign currency contracts
Derivative [Line Items]
Derivative, notional amount	$ 20.9	$ 23.5	$ 27.4
Derivative, Remaining Maturity	9 months	12 months	9 months
Cash Flow Hedging | Commodity contracts
Derivative [Line Items]
Derivative, notional amount in gold | oz	73	81	70
Derivative, Remaining Maturity	14 months	11 months	12 months