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Note 9 - Goodwill (Details) - Changes in the Carrying Amount of Goodwill by Segment (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2014
Goodwill [Line Items]  
Balance $ 285,608us-gaap_Goodwill
Foreign currency translations (6,187)us-gaap_GoodwillTranslationAdjustments
Balance 279,421us-gaap_Goodwill
UNITED STATES  
Goodwill [Line Items]  
Balance 179,434us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_US
Foreign currency translations 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementGeographicalAxis
= country_US
Balance 179,434us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= country_US
Europe [Member]  
Goodwill [Line Items]  
Balance 103,032us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Foreign currency translations (5,795)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Balance 97,237us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Asia Pacific [Member]  
Goodwill [Line Items]  
Balance 3,142us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
Foreign currency translations (392)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
Balance $ 2,750us-gaap_Goodwill
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember