FINANCING ARRANGEMENTS (Note Hedge and Warrant Arrangements) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		9 Months Ended
	Apr. 30, 2015	Nov. 30, 2015	Nov. 30, 2014
Debt Instrument [Line Items]
Purchase of note hedges, net of tax		$ (19,324)
Proceeds from issuance of warrants		$ 15,991
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
Note Hedge [Member]
Debt Instrument [Line Items]
Number of common stock with hedge transactions		6,250
Principal amount		$ 172,500
Payments for notes hedges		31,300
Purchase of note hedges, net of tax		$ 19,300
Conversion price for the Notes		$ 27.594
Issue discount interest deductible for income tax purposes		$ 31,300
Deferred tax asset		$ 12,000