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Commitments (Narrative) (Details)	May 02, 2017 USD ($) ft² option property	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)
Long-term Purchase Commitment [Line Items]
Letter of credit outstanding		$ 0
Standby letters of credit [Member]
Long-term Purchase Commitment [Line Items]
Line of credit borrowing capacity			$ 500,000
Capital Lease and Other Financing Lease [Member]
Long-term Purchase Commitment [Line Items]
Area of lease property (in sqft) | ft²	110,783
Term of lease contract	10 years
Number of renewal options | option	2
Renewal option term	5 years
Number of options to terminate | option	1
Future minimum payments due	$ 24,100,000
Option for additional area of lease (in sqft) | ft²	170,000
Capital Lease and Other Financing Lease [Member] | Building shells [Member]
Long-term Purchase Commitment [Line Items]
Number of leased properties | property	2

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- Definition

Capital Leases, Number of Options to Terminate

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- Definition

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- Definition

Capital Leases, Option, Additional Area of Real Estate Property

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- Definition

Lessee Leasing Arrangements, Capital Leases, Renewal Term

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Lessee Leasing Arrangements, Capital Leases, Term of Contract

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- Definition

Area of a real estate property.

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- Definition

Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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

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- 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.

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- Definition

The number of real estate properties owned as of the balance sheet date.

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