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Quarterly Financial Information (Unaudited) (Narrative) (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Effect of Fourth Quarter Events [Line Items]
Recapitalization Costs	$ 700,000us-gaap_RecapitalizationCosts
Unfavorable litigation action
Effect of Fourth Quarter Events [Line Items]
Amount returned that was previously reserved to the income statement	1,250,000us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_LossContingenciesByNatureOfContingencyAxis = alg_UnfavorableLitigationActionMember
Patent Infringement
Effect of Fourth Quarter Events [Line Items]
Charge relating to various litigation matters		$ 1,800,000us-gaap_LegalFees / us-gaap_LossContingenciesByNatureOfContingencyAxis = alg_PatentInfringementMember

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- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

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Amount of recapitalization costs for professional fees associated with restructuring debt and equity mixture that do not qualify for capitalization.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b)(1))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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