Basis of Presentation Basis of Presentation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Jun. 30, 2014
Basis of Presentation [Abstract]
Quantifying Misstatement in Current Year Financial Statements Adjustment Amount	$ 1.7
Quantifying Misstatement in Current Year Financial Statements Amount Per Diluted Share	$ 0.02

Impact per diluted share of errors being corrected in the correcting adjustment.

No definition available.

Name:	hsc_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountPerDilutedShare
Namespace Prefix:	hsc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration