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Debt (Details 4) (USD $)
Nov. 30, 2014
Feb. 28, 2014
Long-term debt    
Limit on additional debt borrowings $ 149,110,000hele_DebtInstrumentAdditionalBorrowingCapacityAmountLimit  
Credit Agreement    
Long-term debt    
Maximum revolving commitment 570,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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3.90% unsecured Senior Notes | Fair Values    
Long-term debt    
Long-term debt 82,674,000us-gaap_LongTermDebtFairValue
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83,951,000us-gaap_LongTermDebtFairValue
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3.90% unsecured Senior Notes | Fair Values | Significant Other Observable Market Inputs (Level 2)    
Long-term debt    
Long-term debt 82,674,000us-gaap_LongTermDebtFairValue
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83,951,000us-gaap_LongTermDebtFairValue
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3.90% unsecured Senior Notes | Fair Values | Significant Other Observable Market Inputs (Level 2) | Discounted cash flow analysis    
Long-term debt    
Long-term debt 82,670,000us-gaap_LongTermDebtFairValue
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3.90% unsecured Senior Notes | Book value    
Long-term debt    
Long-term debt $ 80,000,000us-gaap_LongTermDebtFairValue
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