The amount of expense provided in the period for legal costs incurred which will be paid by insurance.

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- Definition

Represents the proposed additional amount receivable by the entity for a broad mutual release by the entity and insurers of any further rights or obligations under directors' and officers' liability insurance policies.

+ Details

Name:	artc_LitigationSettlementGrossAdditionalAmount
Namespace Prefix:	artc
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- Definition

Identifies the number of shareholders who alleged claims on behalf of the entity.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Represents the number of putative securities class actions that were consolidated with shareholder derivative actions.

+ Details

Name:	artc_PutativeSecuritiesClassActionsConsolidatedWithShareholderDerivativeActionsNumber
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Data Type:	xbrli:integerItemType
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- Definition

Represents the number of shareholder derivative actions that were consolidated.

+ Details

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Period Type:	instant

- Definition

This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.

+ Details

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- 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.

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LITIGATION AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					1 Months Ended
	Dec. 31, 2008 Private Securities Class Action and Shareholder Derivative Lawsuits Action	Mar. 18, 2009 Shareholder Derivative Actions, State Court Shareholder	Oct. 27, 2008 Shareholder Derivative Actions, State Court Shareholder	Oct. 20, 2008 Shareholder Derivative Actions, State Court Shareholder	Sep. 23, 2008 Shareholder Derivative Actions, State Court Shareholder	Oct. 31, 2010 Shareholder Derivative Actions
Litigation and Contingencies
Number of putative securities class actions consolidated with shareholder derivative actions	2
Number of shareholders alleging claims			1	1	1
Number of shareholder derivative actions consolidated		3
Amount of proposed settlement receivable by the entity						$ 8.0
Legal fees paid by insurance						2.25
Additional amount of proposed settlement receivable by the entity						$ 2.0