Goodwill and Other Intangibles - By Class (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Aug. 31, 2016
Goodwill and intangible assets
Gross Carrying Value	$ 88,859		$ 69,932
Accumulated Amortization	37,435		33,352
Net Carrying Value	51,424		$ 36,580
Aggregate amortization expense	4,506	$ 3,836
Estimated amortization expense
2017 (remaining 6 months)	4,584
2018	9,120
2019	8,427
2020	7,563
2021	7,027
2022	$ 6,159
Patents and agreements
Goodwill and intangible assets
Weighted-Average Amortization Period	14 years 6 months		14 years 6 months
Gross Carrying Value	$ 1,830		$ 1,805
Accumulated Amortization	1,669		1,663
Net Carrying Value	$ 161		$ 142
Formulas and technology
Goodwill and intangible assets
Weighted-Average Amortization Period	7 years 10 months 24 days		8 years 4 months 24 days
Gross Carrying Value	$ 9,401		$ 8,248
Accumulated Amortization	4,851		4,310
Net Carrying Value	$ 4,550		$ 3,938
Trade names
Goodwill and intangible assets
Weighted-Average Amortization Period	6 years		5 years 10 months 24 days
Gross Carrying Value	$ 7,847		$ 7,137
Accumulated Amortization	5,394		4,909
Net Carrying Value	$ 2,453		$ 2,228
Customer lists and relationships
Goodwill and intangible assets
Weighted-Average Amortization Period	9 years 7 months 6 days		9 years 4 months 24 days
Gross Carrying Value	$ 69,781		$ 52,742
Accumulated Amortization	25,521		22,470
Net Carrying Value	$ 44,260		$ 30,272