Goodwill and Other Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2017	Jul. 01, 2017	Aug. 31, 2016
Goodwill [Line Items]
Goodwill impairment charges	$ 9,000		$ 0	$ 8,845	$ 141,021
Goodwill			166,847	166,847		$ 167,835		$ 166,847
Goodwill, Impaired, Accumulated Impairment Loss						471,000		471,000
Goodwill [Roll Forward]
Goodwill, beginning of period			166,847
Goodwill impairment charge	(9,000)		0	(8,845)	(141,021)
Goodwill, end of period			167,835	166,847
AMR
Goodwill [Line Items]
Goodwill impairment charges	9,000	$ 141,000		8,845
Goodwill			166,847	175,676	175,676	$ 167,835		$ 166,847
Goodwill [Roll Forward]
Goodwill, beginning of period			166,847	175,676
Foreign currency translation adjustment			988	16
Goodwill impairment charge	$ (9,000)	$ (141,000)		(8,845)
Goodwill, end of period			$ 167,835	$ 166,847	$ 175,676
Regionally Defined Reporting Unit Consisting Of One Component | AMR
Goodwill [Line Items]
Goodwill							$ 167,000