Note 4 - Fair Value Measures - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		Aug. 31, 2018	Aug. 31, 2017
Derivative instruments	[1]	$ 90	$ 6,142
Total assets measured at fair value		29,424	65,263
Derivative instruments	[1]	4,036
Total liabilities measured at fair value		4,036
Money Market Funds [Member]
Corporate money market funds	[2]	75	26,677
Mutual Funds [Member]
Mutual funds	[3]	18,668	18,364
Certificates of Deposit [Member]
Certificates of deposit	[4]	10,591	14,080
Fair Value, Inputs, Level 1 [Member]
Derivative instruments	[1]
Total assets measured at fair value		75	26,677
Derivative instruments	[1]
Total liabilities measured at fair value
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Corporate money market funds	[2]	75	26,677
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
Mutual funds	[3]
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Certificates of deposit	[4]
Fair Value, Inputs, Level 2 [Member]
Derivative instruments	[1]	90	6,142
Total assets measured at fair value		29,349	38,586
Derivative instruments	[1]	4,036
Total liabilities measured at fair value		4,036
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Corporate money market funds	[2]
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
Mutual funds	[3]	18,668	18,364
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Certificates of deposit	[4]	10,591	14,080
Fair Value, Inputs, Level 3 [Member]
Derivative instruments	[1]
Total assets measured at fair value
Derivative instruments	[1]
Total liabilities measured at fair value
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Corporate money market funds	[2]
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
Mutual funds	[3]
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Certificates of deposit	[4]

[1] The Company utilizes the income approach to measure fair value for its derivative instruments (foreign exchange forward contracts). The income approach uses pricing models that rely on market observable inputs such as spot, forward and interest rates, as well as credit default swap spreads and therefore are classified as Level 2.

[2] The Company's corporate money market funds are readily convertible into cash and the net asset value of each fund on the last day of the quarter is used to determine its fair value. As such, the Company's corporate money market funds are classified as Level 1 and included in Cash and cash equivalents within the Consolidated Balance Sheets.

[3] The Company's mutual funds have a fair value based on the fair value of the underlying investments held by the mutual funds allocated to each share of the mutual fund using a net asset value approach. The fair value of the underlying investments is based on observable inputs. As such, the Company's mutual funds are classified as Level 2 and are classified as investments (short-term) on the Consolidated Balance Sheets.

[4] The Company's certificates of deposit held for investment are not debt securities and are classified as Level 2. These certificates of deposit have original maturities greater than three months, but less than one year and, as such, are classified as investments (short-term) within the Consolidated Balance Sheets.