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Summary Of Significant Accounting Policies (Software) (Details) (Software [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Out-of-period impact expense (revenue) adjustment $ 1.1us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
Net Revenue [Member]  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Out-of-period impact expense (revenue) adjustment (4.2)us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= hill_RevenueRecognitionSoftwareMember
Cost of Goods Sold [Member]  
Quantifying Misstatement in Current Year Financial Statements [Line Items]  
Out-of-period impact expense (revenue) adjustment $ 3.1us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfGoodsTotalMember
/ us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsByNatureOfErrorAxis
= hill_RevenueRecognitionSoftwareMember