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Subsequent Events Subsequent Events (Details) $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($)
Debt Instrument, Redemption [Line Items]
Amount of bonds redeemed	$ 217

X

- Definition

The amount of bonds redeemed.

+ References

No definition available.

+ Details

Name:	tve_AmountOfBondsRedeemed
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

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