Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenues [Abstract]
Revenues	$ 435,846	$ 366,268
Cost of Revenue [Abstract]
Cost of product sales and services	(305,537)	(255,760)
Gross profit	130,309	110,508
Operating Expenses [Abstract]
General and administrative expense	(64,076)	(57,829)
Sales and marketing expense	(40,386)	(36,449)
Research and development expense	(3,835)	(3,452)
Total operating expenses	(108,297)	(97,730)
Other operating income	1,297	1,657
Other operating expense	(77)	(147)
Operating profit (loss)	23,232	14,288
Interest expense	(10,074)	(6,579)
Income before income taxes	13,158	7,709
Income tax expense	(3,890)	(1,621)
Net income	9,268	6,088
Net income attributable to Evoqua Water Technologies Corp.	$ 9,268	$ 5,987
Basic income per common share	$ 0.08	$ 0.05
Diluted income per common share	$ 0.07	$ 0.05
Non-controlling Interest
Operating Expenses [Abstract]
Net income	$ 0	$ 101
Net income attributable to non‑controlling interest	0	101
Revenue from product sales
Revenues [Abstract]
Revenues	260,391	212,568
Cost of Revenue [Abstract]
Cost of product sales and services	(185,040)	(153,795)
Revenue from service
Revenues [Abstract]
Revenues	175,455	153,700
Cost of Revenue [Abstract]
Cost of product sales and services	$ (120,497)	$ (101,965)