Loss Contingencies (Narratives) (Details) - USD ($)		3 Months Ended				6 Months Ended	12 Months Ended
	Aug. 02, 2012	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Mar. 31, 2019
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 13,938,000				$ 13,938,000
Estimation of asbestos-related aggregate liability that is probable and estimable		5,897,000				5,897,000
Insurance Recoveries		120,000	$ 9,000	$ 621,000	$ 1,741,000
Estimation of product-related aggregate liability		6,629,000				6,629,000
Loss Contingency Alleged Taxes Owed	$ 7,800,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest	$ 3,200,000
Accrual for Environmental Loss Contingencies		1,116,000				1,116,000
Estimated Litigation Liability		300,000				300,000
Minimum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery						2,000,000
Estimation of asbestos-related aggregate liability that is probable and estimable		4,000,000				4,000,000
Maximum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery						6,000,000
Estimation of asbestos-related aggregate liability that is probable and estimable		7,700,000				7,700,000
Magnetek [Member]
Loss Contingencies [Line Items]
Estimation of asbestos-related aggregate liability that is probable and estimable		1,000,000				1,000,000
Accrual for Environmental Loss Contingencies		324,000				324,000
Fiscal year 2004 [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery						3,000,000
Fiscal year 2003 [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Product Liability Contingency, Third Party Recovery						2,000,000
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual		10,365,000				10,365,000
Accrued Liabilities
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross		3,573,000				3,573,000
Scenario, Forecast [Member]
Loss Contingencies [Line Items]
Asbestos liability payments							$ 2,000,000
Loss settlement gross period							12 months
Loss Contingency Alleged Taxes Owed							$ 2,200,000
Loss Contingency Alleged Taxes Owed Including Penalties And Interest							$ 3,000,000
Scenario, Forecast [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Loss contingency period							37 years
DEP [Member] | Magnetek [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies		$ 186,000				$ 186,000