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Commitments (Narrative) (Details) | May 02, 2017 USD ($) ft² option property | Jun. 30, 2017 USD ($) | May 31, 2017 USD ($)
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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 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 + Details
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