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Debt (Details) (USD $)
3 Months Ended 1 Months Ended
Dec. 31, 2014
Feb. 06, 2015
Sep. 30, 2014
Debt      
Total long-term debt $ 80,000,000us-gaap_LongTermDebt   $ 80,000,000us-gaap_LongTermDebt
Less long-term debt due within one year 40,000,000us-gaap_LongTermDebtCurrent   40,000,000us-gaap_LongTermDebtCurrent
Long-term debt 40,000,000us-gaap_LongTermDebtNoncurrent   40,000,000us-gaap_LongTermDebtNoncurrent
Proceeds on short-term debt 1,002,000us-gaap_ProceedsFromShortTermDebt    
Issued to support international operations      
Debt      
Long-term debt stated interest rate percentage 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditTwoMember
   
Available borrowing capacity to use for letters of credit 9,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditTwoMember
   
Number of letters of credit outstanding 2hp_LettersOfCreditOutstandingNumber
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditTwoMember
   
Letters of credit outstanding/issued 12,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditTwoMember
   
Proceeds on short-term debt 1,000,000us-gaap_ProceedsFromShortTermDebt
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditTwoMember
   
Issued to support international operations | Subsequent Event.      
Debt      
Repayment of debt   1,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditTwoMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Unsecured revolving credit facility mature May 25, 2017      
Debt      
Borrowing amount 300,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Commitment fee (as a percent) 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Borrowing amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Available borrowing capacity excluding letters of credit transaction 257,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Unsecured revolving credit facility mature May 25, 2017 | Maximum      
Debt      
Funded leverage ratio (as a percent) 50.00%hp_DebtInstrumentCovenantFundedLeverageRatio
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Commitment fee (as a percent) 0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Unsecured revolving credit facility mature May 25, 2017 | Minimum      
Debt      
Interest coverage ratio 3.00hp_DebtInstrumentCovenantInterestCoverageRatio
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Commitment fee (as a percent) 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Unsecured revolving credit facility mature May 25, 2017 | London Interbank Offered Rate (LIBOR)      
Debt      
LIBOR spread on borrowings (as a percent) 1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Unsecured revolving credit facility mature May 25, 2017 | London Interbank Offered Rate (LIBOR) | Maximum      
Debt      
LIBOR spread on borrowings (as a percent) 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Unsecured revolving credit facility mature May 25, 2017 | London Interbank Offered Rate (LIBOR) | Minimum      
Debt      
LIBOR spread on borrowings (as a percent) 1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Unsecured revolving credit facility mature May 25, 2017 | Letter of credit      
Debt      
Available borrowing capacity to use for letters of credit 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Number of letters of credit outstanding 3hp_LettersOfCreditOutstandingNumber
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Letters of credit outstanding/issued 42,200,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= hp_LetterOfCreditOneMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
   
Unsecured senior notes issued July 21, 2009      
Debt      
Total long-term debt 80,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotesIssued2009Member
   
Long-term debt stated interest rate percentage 6.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotesIssued2009Member
   
Annual principal repayments 40,000,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotesIssued2009Member
   
Unsecured senior notes issued July 21, 2009 | Maximum      
Debt      
Funded leverage ratio (as a percent) 55.00%hp_DebtInstrumentCovenantFundedLeverageRatio
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotesIssued2009Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Unsecured senior notes issued July 21, 2009 | Minimum      
Debt      
Interest coverage ratio 2.50hp_DebtInstrumentCovenantInterestCoverageRatio
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotesIssued2009Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Due July 21, 2015, 6.10%      
Debt      
Total long-term debt 40,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2015Member
  40,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2015Member
Long-term debt stated interest rate percentage 6.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2015Member
  6.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2015Member
Due July 21, 2016, 6.10%      
Debt      
Total long-term debt $ 40,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2016Member
  $ 40,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2016Member
Long-term debt stated interest rate percentage 6.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2016Member
  6.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hp_UnsecuredSeniorNotes6.10PercentDueJuly2016Member