Product Warranties (Tables)

3 Months Ended

Dec. 31, 2019

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
	Three Months Ended December 31,						Three Months Ended December 31,
	2019			2018			2019			2018
Balance at beginning of the period	$	4,922		$	8,907		$	2,332		$	3,360
Warranty provision for sales	1,251			1,373			44			300
Settlement of warranty claims	(1,989		)	(1,428		)	(1,076		)	—
Amounts related to sale of the Memcor product line	795			—			135			—
Foreign currency translation and other	152			124			36			(4		)
Balance at end of the period	$	5,131		$	8,976		$	1,471		$	3,656