Restructuring - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2017	Apr. 30, 2017
Restructuring Cost and Reserve [Line Items]
Cash paid		$ 400
Technical Nonwovens
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax restructuring expense		4,200
Restructuring, expected costs resulting in future cash expenditures				$ 3,700
Cash paid		379	$ 3,800
Technical Nonwovens | Selling, Product Development and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses, excluding depreciation		$ 400
Forecast | Technical Nonwovens
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses, excluding depreciation	$ 900