Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Thousands			6 Months Ended
	Mar. 09, 2018	Jan. 31, 2018	Mar. 31, 2018
Pure Water Solutions [Member]
Business Acquisition [Line Items]
Consideration transferred, liabilities incurred		$ 4,699
Payments to acquire businesses, gross		3,706
Stock purchase price, net of cash received		$ 993
Accrued earnout related to acquisitions			$ 461
Pacific Ozone [Member]
Business Acquisition [Line Items]
Consideration transferred, liabilities incurred	$ 8,557
Payments to acquire businesses, gross	6,557
Stock purchase price, net of cash received	$ 2,000