Product Warranties (Tables)

6 Months Ended

Mar. 31, 2021

Guarantees and Product Warranties [Abstract]

Schedule of product warranty liability

A reconciliation of the activity related to the accrued warranty, including both the current and long‑term portions, is as follows:

	Current Product Warranties				Non-Current Product Warranties
	Six Months Ended March 31,				Six Months Ended March 31,
	2021		2020		2021		2020
Balance at beginning of the period	$	6,115	$	4,922	$	1,724	$	2,332
Warranty provision for sales	2,188		1,892		714		62
Settlement of warranty claims	(1,699)		(2,567)		(471)		(1,248)
Amounts related to sale of the Memcor product line	—		795		—		135
Foreign currency translation and other	110		65		22		(120)
Balance at end of the period	$	6,714	$	5,107	$	1,989	$	1,161