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Commitments and Contingencies (Details)	3 Months Ended
	Sep. 30, 2018 USD ($) letter_of_credit
Debt Instrument [Line Items]
Total lease commitment	$ 15,000,000
Lease commitment term	10 years
Number of letters of credit provided as collateral | letter_of_credit	2
Standby Letters of Credit
Debt Instrument [Line Items]
Current borrowing capacity	$ 18,000,000
Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	250,000,000
Unused portion of credit facility	234,000,000
Credit Facility | Swingline Facility
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	20,000,000
Collateral for Workers' Compensation Obligation | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	5,000,000
Unused portion of credit facility	$ 3,000,000

X

- Definition

Lessee, Operating Lease Modified During Period, Term of Contract

+ References

No definition available.

+ Details

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X

- Definition

Number of Letters of Credit

+ References

No definition available.

+ Details

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X

- Definition

Operating Leases, Modified During Period, Future Minimum Payments Due

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

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.

+ References

No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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-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

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