Goodwill and Intangibles (Details) - USD ($) $ in Thousands	May 31, 2016	Aug. 31, 2015
Goodwill [Line Items]
Goodwill	$ 159,572	$ 150,115
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	4,595
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,911
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,909
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,704
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3,486
Nitrogen Production [Member]
Goodwill [Line Items]
Goodwill	$ 0