Warrants (Details) - Warrants [Member]	9 Months Ended
Apr. 30, 2018
Class of Warrant or Right [Line Items]
Expected dividend yield	0.00%
Maximum [Member]
Class of Warrant or Right [Line Items]
Expected stock price volatility	176.73%
Risk-free interest rate	2.80%
Expected term	5 years
Minimum [Member]
Class of Warrant or Right [Line Items]
Expected stock price volatility	160.93%
Risk-free interest rate	2.24%
Expected term	3 years

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

No definition available.

+ Details

Name:	dtgi_FairValueAssumptionExpectedDividendRate
Namespace Prefix:	dtgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	dtgi_FairValueAssumptionExpectedTerm
Namespace Prefix:	dtgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

No definition available.

+ Details

Name:	dtgi_FairValueAssumptionRiskFreeInterestRate
Namespace Prefix:	dtgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

No definition available.

+ Details

Name:	dtgi_FairValueAssumptionsExpectedStockPriceVolatility
Namespace Prefix:	dtgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: