Commitments (Detail) (Century Thrust Joint Venture Agreement, USD $) In Millions, unless otherwise specified	Apr. 30, 2013
Commitments Disclosure [Line Items]
Funding commitment, funded and expensed as incurred	$ 3.79
Century Concession in Laos
Commitments Disclosure [Line Items]
Funding commitment, unfunded amount	$ 2.71

The aggregate amount as of the balance sheet date that the entity provided to another person or entity to fund exploration costs in connection with an optional spending commitment, which was expensed as incurred.

No definition available.

Name:	aurm_ExplorationExpenseFundingCommitmentFundedAmount
Namespace Prefix:	aurm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant