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Subsequent Events	6 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 2, 2018, the Company granted 1,325 options to certain employees of the Company and 19 restricted stock units to certain non-employee directors of the Company. On April 9, 2018, WTG Holdings Coöperatief U.A., a wholly-owned subsidiary of the Company, completed the sale of 100% of the corporate capital of Evoqua Water Technologies S.r.l., which includes the Company’s former operations in Italy, to Giotto Water S.r.l. The aggregate purchase price paid in cash by Giotto in the transaction was €350,000, subject to certain earn out adjustments to be paid by Giotto in connection with the realization of specified tax benefits relating to previous years.