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RELATED PARTY TRANSACTIONS AND CERTAIN OTHER TRANSACTIONS (Details) - Chief Executive Officer - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Nov. 13, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Aircraft lease agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Rate to lease aircraft | $ 5,000 |  |  |  |
Sales, general and administrative |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Aircraft leasing expenses |  | $ 500,000 | $ 900,000 | $ 400,000 | $ 700,000

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- Definition Expenses incurred related to the lease of aircraft from outside third parties that are used in the entity's business operations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Aircraft Leasing Hourly Rate + References No definition available. + Details
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Namespace Prefix: | wfx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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- Details
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- Details
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