Name:	thr_GuaranteeObligationsCashDepositsPledgedAsCollateral
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the amount of guarantee obligations represented by a reduction of the available amount of the entity's revolving lines of credit.

No definition available.

Name:	thr_GuaranteeObligationsRepresentedByReductionOfAvailableAmountOfLinesOfCredit
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of guarantee obligations secured by cash deposits.

No definition available.

Name:	thr_GuaranteeObligationsSecuredByCashDeposits
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Indian Custom Bonds Outstanding

No definition available.

Name:	thr_IndianCustomBondsOutstanding
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

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

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248