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Pension Plan - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2017 | Feb. 28, 2018 | Feb. 28, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employees covered under noncontributory Pension Plan | 20.00% |  |
Compensation period preceding retirement and termination | 5 years |  |
Period used for calculating Pension Plan liability | 25 years |  |
Expected contributions |  |  | $ 3,000,000
Scenario Forecast [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum required contribution to the plan is approximately |  | $ 0 |
Minimum [Member] | Scenario Forecast [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions |  | 2,000,000 |
Maximum [Member] | Scenario Forecast [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions |  | $ 3,000,000 |

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- Definition Amount of minimum contribution(s) required for future periods to a multiemployer plan by collective bargaining arrangements, statutory obligations, or other contractual obligations. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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