Financial Instruments Financial Instruments (Details) $ in Thousands	3 Months Ended	12 Months Ended
Feb. 28, 2017 Rate	Feb. 28, 2019 USD ($) Rate	Feb. 28, 2018 USD ($) Rate
Letters of Credit Outstanding, Amount		$ 0	$ 0
Unrecorded Unconditional Purchase Obligation		$ 56,900
Entity-Wide Revenue, Major Customer, Percentage \| Rate	28.00%	25.00%	26.00%
Number of Customers	0	0	0
Concentration Risk, Benchmark Description	.1	0.1	.1
Accounts Receivable [Member]
Entity-Wide Revenue, Major Customer, Percentage \| Rate		24.00%	22.00%
Letter of Credit [Member]
Letters of Credit Outstanding, Amount		$ 892	$ 1,161

Identifies or describes the benchmark that serves as the denominator in the calculation of the percentage of concentration risk.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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- Definition

Number of Customers

+ References

No definition available.

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