Debt - Summary of covenant levels of financial covenants (Detail)	Jun. 30, 2016	Mar. 31, 2016
Debt Disclosure [Abstract]
Consolidated Total Leverage Ratio (less than)	6.25	6.25
Consolidated Interest Coverage Ratio (greater than)	2.00	2.00

Represents the numerator of the consolidated interest coverage ratio financial covenant under the senior credit facility.

No definition available.

Name:	mfs_DebtInstrumentCovenantConsolidatedInterestCoverageRatioNumerator
Namespace Prefix:	mfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant