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Pension Plan and Other Employee Benefits - Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Pension Cost (Detail)	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Compensation And Retirement Disclosure [Abstract]
Weighted average discount rate (net periodic pension cost)	4.10%	4.30%	4.00%
Earnings progression (net periodic pension cost)	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets (net periodic pension cost)	7.50%	7.50%	8.00%
Weighted average discount rate (benefit obligations)	4.05%	4.10%	4.30%
Earnings progression (benefit obligations)	3.00%	3.00%	3.00%

X

- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Earnings Progression

+ References

No definition available.

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- Definition

Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Earnings Progression

+ References

No definition available.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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