Commitments and Contingencies - Narrative (Details) lawsuit in Thousands	12 Months Ended
	Mar. 31, 2019 USD ($) carrier lawsuit claimant	Mar. 31, 2018 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2002 release defendant
Loss Contingencies [Line Items]
Indemnity obligations (in excess of)	$ 900,000,000
Number of carriers that could impact coverage if insolvent | carrier	1
Net proceeds from sale-leaseback transaction		$ 5,800,000
Gain or loss recognized, sale-leaseback transaction		0
Financing lease obligation	$ 23,000,000
Capital lease obligation		$ 7,500,000
Environmental Issue | Ellsworth Industrial Park Site
Loss Contingencies [Line Items]
Number of releases, or threatened releases, chlorinated solvents (or more) | release				1
Percentage of indemnity obligations paid by seller				100.00%
Environmental Issue | Ellsworth Industrial Park Site | Minimum
Loss Contingencies [Line Items]
Number of defendants (at least) | defendant				10
Asbestos Issue | Stearns
Loss Contingencies [Line Items]
Percentage of indemnity obligations paid by seller	100.00%
Number of pending claims | claimant	300
Asbestos Issue | Prager
Loss Contingencies [Line Items]
Percentage of costs paid by insurance providers	100.00%
Asbestos Issue | Falk
Loss Contingencies [Line Items]
Percentage of indemnity obligations paid by seller	100.00%
Number of pending claims | claimant	100
Asbestos Issue | Zurn
Loss Contingencies [Line Items]
Number of pending claims | claimant	14,000
Number of pending lawsuits | lawsuit	6
Expected time for claim to be filed	10 years
Estimate of potential liability	$ 40,000,000
Amount expected to be paid by insurance providers	$ 30,000,000
Timeframe of estimated claims disbursements	10 years
Damages from Product Defects | Zurn
Loss Contingencies [Line Items]
Claim settlement funding period			7 years
Settlement amount			$ 20,000,000.0