XML 102 R86.htm IDEA: XBRL DOCUMENT v3.3.1.900

Note 18 - Deferred Tax Charge (Details)	12 Months Ended
	Jan. 31, 2016
Minimum [Member]
Note 18 - Deferred Tax Charge (Details) [Line Items]
Amortization Period of Deferred Tax Charge	3 years
Maximum [Member]
Note 18 - Deferred Tax Charge (Details) [Line Items]
Amortization Period of Deferred Tax Charge	8 years

X

- Definition

Represents the period of amortization to income tax expense of a deferred tax charge.

+ References

No definition available.

+ Details

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Namespace Prefix:	dsgx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	dsgx_Note18DeferredTaxChargeDetailsLineItems
Namespace Prefix:	dsgx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: