FINANCING ARRANGEMENTS (Note Hedge and Warrant Arrangements) (Details) - USD ($) $ / shares in Units, shares in Millions		6 Months Ended
	Apr. 30, 2015	Aug. 31, 2015
Debt Instrument [Line Items]
Principal amount		$ 172,500,000
Purchase of note hedges, net of tax		$ (19,324,000)
Conversion price for the Notes		$ 27.594
Warrant [Member]
Debt Instrument [Line Items]
Strike price of underlie convertible notes (in dollars per share)	$ 39.42
Percentage of premium on sale price of common stock	100.00%
Share price (in dollars per share)	$ 19.71
Proceeds from warrants		$ 15,991,000
Note Hedge [Member]
Debt Instrument [Line Items]
Number of common stock with hedge transactions		6.3
Principal amount		$ 172,500,000
Payments for notes hedges		31,343,000
Purchase of note hedges, net of tax		$ 19,324,000
Conversion price for the Notes		$ 27.594
Issue discount interest deductible for income tax purposes		$ 31,343,000
Deferred tax asset		$ 12,000,000