Restructuring - Actual and Estimated Pre-tax Expenses (Details) - Technical Nonwovens - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Total pre-tax expense incurred	$ 154	$ 293	$ 447
Estimated remaining expense at September 30, 2017	4,550		4,550
Total estimated pre-tax expense	4,997		4,997
Severance and Related Expenses
Restructuring Cost and Reserve [Line Items]
Total pre-tax expense incurred	87	74	161
Estimated remaining expense at September 30, 2017	1,000		1,000
Total estimated pre-tax expense	1,161		1,161
Contract Termination Expenses
Restructuring Cost and Reserve [Line Items]
Total pre-tax expense incurred	(49)	185	136
Estimated remaining expense at September 30, 2017	150		150
Total estimated pre-tax expense	286		286
Facility Exit, Move and Set-up Expenses
Restructuring Cost and Reserve [Line Items]
Total pre-tax expense incurred	116	$ 34	150
Estimated remaining expense at September 30, 2017	3,400		3,400
Total estimated pre-tax expense	$ 3,550		$ 3,550