Document And Entity Information [Abstract] Document Information [Table] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Trading Symbol Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Statement [Table] Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents - beginning of period Cash and cash equivalents - end of period Accounts Receivable, Net, Current Accounts receivable, net Inventory, Net Inventories, net Total Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Financing Receivable, Net Note receivable Costs in Excess of Billings, Current Costs and estimated earnings in excess of billings Other Deferred Costs, Net Deferred customer project costs Project assets Project assets It represents project assets. Assets, Noncurrent [Abstract] Long-term assets: Property, Plant and Equipment, Net Property, plant and equipment, net Property, plant and equipment, net Equity Method Investments Investment in investee company Goodwill Goodwill Beginning balance Ending balance Other Assets, Noncurrent Right of use assets-operating leases Assets Total assets Assets [Abstract] Liabilities, Current [Abstract] Current liabilities: Long-term Debt, Current Maturities Current maturities of long-term debt Less: current maturities of long-term debt Accounts Payable, Current Accounts payable Billings in Excess of Cost, Current Billings in excess of costs and estimated earnings Accrued Liabilities, Current Accrued expenses Deferred Revenue, Current Customer deposits Less: current portion of deferred revenue for extended warranty contracts Employee-related Liabilities, Current Accrued compensation and benefits Liabilities, Noncurrent [Abstract] Long-term liabilities: Long-term Debt, Excluding Current Maturities Long-term debt, net of current maturities Long-term debt Deferred Revenue, Noncurrent Deferred revenue Long-term deferred revenue for extended warranty contracts Liabilities, Other than Long-term Debt, Noncurrent Other long-term liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Liabilities and Equity [Abstract] Liabilities and Equity Series B redeemable convertible preferred stock ($0.01 par value, $1,000 face value) 3,000 shares authorized and issued, 2,300 and 2,575 shares outstanding, preference in liquidation of $5,317,800 and $5,635,866 as of June 30, 2016 and June 30, 2015, respectively Series B redeemable convertible preferred stock ($0.01 par value, $1,000 face value), 3,000 shares authorized and issued, 2,300 shares outstanding, preference in liquidation of $5,714,363 and $5,631,086 as of September 30, 2017 and June 30, 2017, respectively Series C convertible preferred stock ($0.01 par value, $1,000 face value), 28,048 and 0 shares authorized, issued, and outstanding, preference in liquidation of $12,719,260 and $0 as of June 30, 2016 and June 30, 2015, respectively Series C convertible preferred stock ($0.01 par value, $1,000 face value), 28,048 shares authorized, issued, and outstanding, preference in liquidation of $8,766,036 and $12,276,682 as of September 30, 2017 and June 30, 2017, respectively Preferred C Stock Value It represents preferred C stock value. Common stock ($0.01 par value); 300,000,000 and 150,000,000 authorized, 47,752,821 and 39,129,334 shares issued and outstanding as of June 30, 2016 and June 30, 2015, respectively Common stock ($0.01 par value), 300,000,000 authorized, 55,604,327 and 55,200,963 shares issued and outstanding as of September 30, 2017 and June 30, 2017, respectively Additional paid-in capital Additional paid-in capital Accumulated deficit Accumulated deficit Accumulated other comprehensive loss Accumulated other comprehensive loss Total EnSync, Inc. Equity Total EnSync, Inc. equity Beginning Balance Total EnSync, Inc. Equity Ending Balance Total EnSync, Inc. equity as of March 31, 2017 Noncontrolling interest Noncontrolling interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total equity Liabilities and Equity Total liabilities and equity StatementClassOfStock [Axis] Class of Stock [Domain] Series B Preferred Stock [Member] Series C Preferred Stock [Member] Statement [Line Items] State ment [ Line Item] Preferred stock, par value Preferred stock, face value Preferred stock, face value Preferred stock, authorized shares Preferred stock, issued shares Preferred stock, issued shares Preferred stock, outstanding shares Preferred stock, outstanding shares Preferred Stock, Shares Outstanding Preferred stock, liquidation preference Common stock, par value Common stock, Authorized Common Stock, Shares Authorized Common stock, Issued Common stock, outstanding Income Statement [Abstract] Revenue, Net Revenues Revenues Revenues Cost of product sales Cost of product sales Cost of product sales to Meineng Energy Cost of engineering and development Cost of engineering and development It represents cost of engineering and development. Advanced engineering and development Advanced engineering and development Selling, general, and administrative Selling, general and administrative Depreciation and amortization Depreciation and amortization Impairment of Long-Lived Assets to be Disposed of Impairment of long-lived assets Costs and Expenses Total costs and expenses Costs and Expenses [Abstract] Costs and expenses Equity in loss of investee company Equity in gain (loss) of investee company Equity in (gain) loss of investee company Interest income Interest income Interest Expense Interest expense Other Nonoperating Income (Expense) Other income Nonoperating Income (Expense) Total other income (expense) Loss before expense (benefit) for income taxes Loss before benefit for income taxes Expense (benefit) for income taxes Benefit for income taxes Provision for income taxes Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to noncontrolling interest Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Parent Net loss attributable to EnSync, Inc. Net loss Net Loss Preferred Stock Dividend Preferred stock dividend Net Loss Attributable to Common Shareholders Net loss attributable to common shareholders Net Loss per share - Basic and diluted Net loss per share Basic and diluted Weighted average shares-basic and diluted: Weighted average shares - basic and diluted Statement of Comprehensive Income [Abstract] Foreign exchange translation adjustments Foreign exchange translation adjustments Comprehensive loss Comprehensive loss Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Shares, Outstanding Beginning Balance (Shares) Ending Balance (Shares) Net currency translation adjustment Net currency translation adjustment Issuance of common stock, net of costs and underwriting fees, Amount Issuance of common stock, net of costs and underwriting fees Issuance of common stock, net of costs and underwriting fees, Shares Issuance of common stock, net of costs and underwriting fees (Shares) Contribution of capital from noncontrolling interest Contribution of capital from noncontrolling interest Contribution of capital from noncontrolling interest Stock-based compensation, Amount Stock-based compensation Stock-based compensation, Shares Stock-based compensation (Shares) Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options (Shares) Number of Options exercised Statement of Cash Flows [Abstract] Cash flows from operating activities Cash flows from operating activities Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Depreciation of property, plant and equipment Depreciation of property, plant and equipment Stock-based compensation, net Stock-based compensation, net Inventory Write-down Provision for inventory reserve Gain (Loss) on Disposition of Property Plant Equipment Gain on sale of property and equipment Gain on sale of property and equipment Interest and Dividend Income, Securities, Operating, Other Interest accreted on note receivable Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepaids and other current assets Increase (Decrease) in Cost in Excess of Billing on Uncompleted Contract Costs and estimated earnings in excess of billings Increase (Decrease) in Deferred Charges Deferred PPA project costs Increase (Decrease) in Other Operating Assets Deferred customer project costs Increase Decrease Project Assets Project assets It represents increase decrease project assets. Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Billing in Excess of Cost of Earnings Billings in excess of costs and estimated earnings Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Customer Deposits Customer deposits Cash flows from investing activities Cash flows from investing activities Payments to Acquire Property, Plant, and Equipment Expenditures for property and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property and equipment Proceeds from Sale of Loans Receivable Payments from note receivable Cash flows from financing activities Cash flows from financing activities Repayments of Long-term Debt Repayments of long term debt Proceeds from issuance of common stock Proceeds from issuance of common stock Effect of exchange rate changes on cash and cash equivalents Effect of exchange rate changes on cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Right of use asset obtained in exchange for new operating lease Right of use asset obtained in exchange for new operating lease It represents right of use asset obtained in exchange for new operating lease. Accounting Policies [Abstract] Summary Of Significant Accounting Policies Tables [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Equity Method Investments and Joint Ventures [Abstract] Notes to Financial Statements [Abstract] CHINA JOINT VENTURE Business Combination [Abstract] Business Combination Disclosure [Text Block] BUSINESS COMBINATIONS Organization, Consolidation and Presentation of Financial Statements [Abstract] MANAGEMENT'S PLANS AND FUTURE OPERATIONS Inventory Disclosure [Abstract] INVENTORIES Receivables [Abstract] NOTES RECEIVABLE Property, Plant and Equipment [Abstract] PROPERTY, PLANT & EQUIPMENT Debt Disclosure [Abstract] DEBT Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs Share Based Payments Text Block EMPLOYEE AND DIRECTOR EQUITY INCENTIVE PLANS Earnings Per Share [Abstract] Earnings Per Share Text Block BASIC AND DILUTED NET LOSS PER SHARE Equity [Abstract] Stockholders' Equity Note Disclosure [Text Block] EQUITY Commitments and Contingencies Disclosure [Abstract] Commitments Disclosure Text Block COMMITMENTS Compensation and Retirement Disclosure [Abstract] Compensation And Employee Benefit Plans Text Block RETIREMENT PLANS Income Tax Disclosure [Abstract] INCOME TAXES Description of Business Description of Business Long-term Contracts for Purchase of Electric Power [Policy Text Block] Power Purchase Agreements Disclosure of accounting policy information concerning the terms and significance of long term contracts to purchase power (generally referred to as purchase power agreements (PPAs) or power sale agreements. Comparability of Prior Year Financial Data, Policy [Policy Text Block] Interim Financial Data Basis of Presentation and Consolidation Basis of Presentation and Consolidation Use of Estimates Use of Estimates Fair Value of Financial Instruments Fair Value of Financial Instruments Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Receivables, Policy [Policy Text Block] Accounts Receivable Inventory, Policy [Policy Text Block] Inventories Note Receivable Note Receivable Disclosure of accounting policy for note receivable. Costs in Excess of Billings and Billings in Excess of Costs [Policy Text Block] Costs and Estimated Earnings in Excess of Billings/Billings in Excess of Costs and Estimated Earnings Disclosure of accounting policy for billings on uncompleted contracts in excess of costs and costs of uncompleted contracts in excess of billings. Deferred Customer Project Costs [Policy Text Block] Deferred Customer Project Costs Disclosure of accounting policy for deferred customer project costs. Project Assets [Policy Text Block] Project Assets Disclosure of accounting policy for project assets. Property, Plant and Equipment Property, Plant and Equipment Impairment of Long-Lived Assets Impairment of Long-Lived Assets Equity Method Investments, Policy [Policy Text Block] Investment in Investee Company Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill Accrued Expenses Accrued Expenses The entire disclosure for accrued expenses, including all tables. Warranty Obligations Warranty Obligations Revenue Recognition Revenue Recognition Engineering, Development, and License Revenues Engineering, Development, and License Revenues Disclosure of accounting policy for engineering, development, and license revenues. Advanced Engineering and Development Expenses Advanced Engineering and Development Expenses Stock-Based Compensation Stock-Based Compensation Advertising Expense Advertising Expense Income Tax, Policy [Policy Text Block] Income Taxes Foreign Currency Foreign Currency Schedule of Accounts Receivable Schedule of Accounts Receivable Estimated Useful Lives Used For Each Class of Depreciable Assets Estimated Useful Lives Used For Each Class of Depreciable Assets