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Represent the amount of inventory step up costs.

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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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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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No definition available.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of amortization expense (reversal of expense) for present value of future profits of insurance contract acquired in business combination.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Acquisitions - Supplemental Pro Forma Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									4 Months Ended	8 Months Ended	12 Months Ended			32 Months Ended
	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Feb. 28, 2018	Dec. 31, 2017	Aug. 31, 2018	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2020
Acquisition of Specialty Chemical Intermediates Businesses
Revenue												$ 261,162	$ 281,351	$ 284,188
Net income	$ 9,008	$ 9,908	$ 7,879	$ 7,362	$ 10,074	$ 8,541	$ 5,273	$ 8,823				34,157	$ 32,711	43,143
Acquisition-related costs (Note 14)												$ 274		$ 393
Statutory tax rate (as a percent)										35.00%	21.00%	21.00%	21.00%	25.70%	21.00%
New Credit Agreement
Acquisition of Specialty Chemical Intermediates Businesses
Amount drawn remained outstanding	$ 0				$ 0							$ 0	$ 0		$ 0
Zappa Stewart
Acquisition of Specialty Chemical Intermediates Businesses
Revenue since acquisition date											$ 16,324
Net income (loss) since acquisition date											578
Inventory step-up costs											1,070
Acquisition-related costs (Note 14)									$ 393		393
Amortization expense											2,672
Amount drawn remained outstanding											$ 65,000			$ 65,000
Statutory tax rate (as a percent)											26.00%
Pro Forma Information
Revenue														292,609
Net income														$ 44,508
Net income available to common shareholders, per common and common equivalent share
Basic earnings per share (in dollars per share)														$ 4.75
Diluted earning per share (in dollars per share)														$ 4.70