The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
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Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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States the date the complaint was formally filed in a court of law, in arbitration or mediation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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The total number of new claims filed pertaining to a loss contingency during the period.

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).

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No definition available.

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Commitments and Contingencies - Additional Information (Detail)				6 Months Ended
	Feb. 28, 2017 USD ($)	Dec. 09, 2016 USD ($)	Nov. 08, 2016 USD ($)	Jul. 15, 2017 USD ($) Lawsuits	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Self-insurance reserves, current liabilities				$ 37,100,000	$ 28,000,000
Alleged complaints \| Lawsuits				30
Class and / or Collective action treatment
Loss Contingencies [Line Items]
Alleged complaints \| Lawsuits				21
Individual claims and do not seek class or collective action treatment
Loss Contingencies [Line Items]
Alleged complaints \| Lawsuits				13
North Carolina Class Action
Loss Contingencies [Line Items]
Legal settlement		$ 9,000,000
Settlement funds		(5,200,000)
Attorney's fee		$ 3,800,000
Lawsuit filing date				September 12, 2012
Connecticut Class Action
Loss Contingencies [Line Items]
Litigation settlement amount including attorney's fees			$ 1,250,000
Tennessee Class Action
Loss Contingencies [Line Items]
Litigation settlement amount including attorney's fees	$ 250,000