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FINANCING ARRANGEMENTS: Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 90,000,000 | $ 90,000,000 | $ 90,000,000 |  | $ 120,599,000
Line of Credit | Revolving Credit Facility | Revolving credit facility (March 2018) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 260,000,000 | 260,000,000 | 260,000,000 |  |
Debt term |  | 5 years |  |  |  |
Line of credit, increase limit |  | $ 150,000,000 | 150,000,000 | 150,000,000 |  |
Long-term debt |  | 90,000,000 | 90,000,000 | 90,000,000 |  | 0
Unused borrowing capacity, amount |  | $ 168,400,000 | $ 168,400,000 | $ 168,400,000 |  |
Interest rate percentage |  | 3.55% | 3.55% | 3.55% |  |
Proceeds from lines of credit |  | $ 90,000,000 |  |  |  |
Line of Credit | Revolving Credit Facility | Revolving credit facility (March 2018) | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 295,000,000.0 |  |  |  |  |
Line of credit, limit increase | $ 35,000,000 |  |  |  |  |
Line of Credit | Revolving Credit Facility | Revolving credit facility (March 2018) | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  | 0.25% |  |  |  |
Line of Credit | Revolving Credit Facility | Revolving credit facility (March 2018) | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  | 0.40% |  |  |  |
Line of Credit | Revolving Credit Facility | Revolving credit facility (March 2018) | LIBOR | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |  |
Line of Credit | Revolving Credit Facility | Revolving credit facility (March 2018) | LIBOR | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.85% |  |  |  |
Line of Credit | Revolving Credit Facility | Revolving credit facility (June 2011) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 0 | $ 0 | $ 0 |  | 0
Unused borrowing capacity, amount |  |  |  |  |  | 198,500,000
Debt face amount |  |  |  |  | $ 200,000,000 |
Interest expense, debt |  |  | $ 100,000 | $ 100,000 |  |
Interest rate percentage |  | 0.00% | 0.00% | 0.00% |  |
Line of Credit | Letter of Credit | Revolving credit facility (March 2018) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 30,000,000 | $ 30,000,000 | $ 30,000,000 |  |
Long-term line of credit |  | 1,600,000 | 1,600,000 | 1,600,000 |  |
Line of Credit | Letter of Credit | Revolving credit facility (June 2011) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term line of credit |  |  |  |  | $ 1,500,000 |
Line of Credit | Swingline Loan | Revolving credit facility (March 2018) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | 30,000,000 | 30,000,000 | 30,000,000 |  |
Senior Notes | Senior Term Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | 0 | $ 0 | $ 0 |  | $ 120,599,000
Interest expense, debt |  | $ 1,700,000 |  |  |  |
Interest rate percentage |  | 5.50% | 5.50% | 5.50% |  |
Repurchase amount |  | $ 124,200,000 | $ 124,200,000 | $ 124,200,000 |  |
Unamortized premium |  | 1,200,000 | $ 1,200,000 | $ 1,200,000 |  |
Repayments of debt |  | $ 34,200,000 |  |  |  |

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- Definition Line of Credit Facility, Accordion Feature, Increase + References No definition available. + Details
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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition 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. + References 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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. + References 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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