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Long-Term Debt - Interest rates (Details) - Credit Agreement $ in Thousands | 12 Months Ended
--- | ---
Feb. 28, 2017 USD ($) item | Feb. 29, 2016 USD ($) | Feb. 28, 2015 USD ($)
Revolving Line of Credit |  |  |
Average borrowings outstanding | $ | $ 498,420 | $ 399,800 | $ 300,280
Average interest rates during each year (as a percent) | 2.20% | 1.60% | 2.50%
Weighted average interest rates on borrowings outstanding at year end (as a percent) | 2.30% | 2.80% | 1.90%
Number of prior quarters used in calculation of average borrowings outstanding | item | 4 |  |
Minimum |  |  |
Revolving Line of Credit |  |  |
Interest rate range during each year (as a percent) | 1.90% | 1.40% | 1.90%
Maximum |  |  |
Revolving Line of Credit |  |  |
Interest rate range during each year (as a percent) | 4.30% | 4.00% | 4.40%

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- Definition The number of quarters prior to the current quarter used in the calculation of average borrowings outstanding. + References No definition available. + Details
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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=64930785&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
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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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
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