Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The carrying value as of the balance sheet date of the noncurrent portion 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Capital Expenditures Limitation

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No definition available.

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- Definition

The ratio of consolidated EBITDA to consolidated interest charges for the most recently completed four fiscal quarters.

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No definition available.

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The ratio of consolidated funded indebtedness as of termination date to consolidated EBITDA for the most recently completed four fiscal quarters.

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No definition available.

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Line of Credit Facility, Additional Borrowed Amount

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No definition available.

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Debt (Narrative) (Details)	9 Months Ended
Debt (Narrative) (Details)	May 31, 2017 USD ($)	Aug. 31, 2016 USD ($)	Nov. 16, 2015 USD ($)
Debt Instrument [Line Items]
Revolving credit facility, amount outstanding	$ 154,000,000
Current debt	20,000,000
Line of credit, long-term liability	134,000,000	$ 122,000,000
Revolving credit facility, additional borrowed amount	$ 12,000,000
Fourth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Share buy-back plan, amount authorized			$ 150,000,000
Revolving credit facility, expiration date	May 13, 2020
Consolidated leverage ratio	3
Consolidated interest coverage ratio	3
Capital expenditures	$ 7,500,000
Line Of Credit, Headquarters Office [Member]
Debt Instrument [Line Items]
Current debt	20,000,000
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Current debt	0
Maximum [Member] \| Fourth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	175,000,000
9715 Businesspark Avenue, San Diego [Member] \| Fourth Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	$ 18,000,000