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v2.4.1.9

Interest Rates and Company Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Interest and debt expense: |  |  |
Weighted average interest rate during the year | 1.70%us-gaap_DebtInstrumentInterestRateDuringPeriod | 1.10%us-gaap_DebtInstrumentInterestRateDuringPeriod | 1.25%us-gaap_DebtInstrumentInterestRateDuringPeriod
Interest rate at year end | 1.65%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod | 1.78%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod | 0.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Maximum amount outstanding during the year | $ 232,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod | $ 89,632 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod | $ 48,920 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Average amount outstanding during the year | 187,004 us-gaap_LineOfCreditFacilityAverageOutstandingAmount | 18,658 us-gaap_LineOfCreditFacilityAverageOutstandingAmount | 18,707 us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Facility fees | $ 336 us-gaap_LineOfCreditFacilityCollateralFeesAmount | $ 301 us-gaap_LineOfCreditFacilityCollateralFeesAmount | $ 449 us-gaap_LineOfCreditFacilityCollateralFeesAmount

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InterestAndDebtExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of the fees associated with providing collateral for the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCollateralFeesAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration