Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) (USD $)	12 Months Ended
Aug. 31, 2013 Y
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 1	134.43%
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 2	142.22%
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 3	1.32%
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 4	1.46%
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 5	5.0
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 6	0.00%
Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 7	$ 0.06

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 3

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOnecfSixKTpzgZWFZ
Namespace Prefix:	enrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 6

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOneFourFivesFivexEightZSevenTCFV
Namespace Prefix:	enrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 2

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOnekdFivemfXzvfrfZ
Namespace Prefix:	enrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 1

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOneMfDxCRFiveBThreeqFourk
Namespace Prefix:	enrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 4

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOneNrPJgVdlsThreenx
Namespace Prefix:	enrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 5

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOneSKZerockFcBEightcrm
Namespace Prefix:	enrt_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

Stock Options And Warrants Schedule Of Share-based Payment Award, Stock Options, Valuation Assumptions 7

No definition available.

Name:	enrt_ScheduleOfSharebasedPaymentAwardStockOptionsValuationAssumptionsZeroOneNineOneOneTwoThreeSixOneZNyTlnFourXFiveOneWL
Namespace Prefix:	enrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration