The Indenture contains customary terms and conditions, including that upon certain events of default occurring and continuing, either the Trustee or the holders of at least 25% in principal amount of the outstanding Notes may declare 100% of the principal of, and accrued and unpaid interest, if any, on all the Notes to be due and payable. Such events of default include the default by the Company on indebtedness for borrowed money in excess of $10 million and the entry of a judgment for the payment of $10 million or more against the Company which is not paid, discharged or stayed within 60 days.

FINANCING ARRANGEMENTS (Long-term Debt) (Details) $ / shares in Units, shares in Millions		6 Months Ended
	May. 06, 2015 USD ($)	Aug. 31, 2015 USD ($) $ / shares shares	May. 27, 2015 USD ($)	Feb. 28, 2015 USD ($)
Debt Instrument [Line Items]
Convertible senior notes payable, net of discount and debt issuance costs		$ 136,557,000
Note payable to Navman		97,000		$ 688,000
Notes payable, noncurrent		136,654,000		688,000
Less portion due within one year		(97,000)		$ (688,000)
Long-term debt		136,557,000
Long-term debt issuance		172,500,000
Unamortized issuance costs		$ (4,065,000)
Net proceeds used to pay the cost of the convertible note hedge transactions	$ 15,352,000
Maturity date	May 15, 2020
Conversion rate of shares of common stock per $0 principal amount of Notes		36.2398
Conversion price (in dollars per share) \| $ / shares		$ 27.594
Maximum number of shares of common stock that could be issued, following certain corporate events that occur prior to maturity \| shares		2.5
Debt discount to be amortized		$ (31,878,000)
Convertible senior notes (the Notes) [Member]
Debt Instrument [Line Items]
Long-term debt issuance	$ 150,000,000		$ 22,500,000
Interest rate (as a percent)	1.625%	1.625%
Net proceeds from sale of the Notes	$ 167,209,000
Unamortized issuance costs	$ 5,291,000
Percentage of repurchase price of the principal amount		100.00%
Discount rate (as a percent)		6.20%
Conversion premium		$ 20,700,000
Debt discount to be amortized		$ 33,600,000
Effective interest rate		6.20%
Deferred tax asset related to notes issuance		$ 400,000
Deferred tax asset related to equity component of issuance costs		1,000,000
Fair value of the Notes		$ 156,000,000
Debt Instrument, Covenant Description		The Indenture contains customary terms and conditions, including that upon certain events of default occurring and continuing, either the Trustee or the holders of at least 25% in principal amount of the outstanding Notes may declare 100% of the principal of, and accrued and unpaid interest, if any, on all the Notes to be due and payable. Such events of default include the default by the Company on indebtedness for borrowed money in excess of $10 million and the entry of a judgment for the payment of $10 million or more against the Company which is not paid, discharged or stayed within 60 days.