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Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Jan. 31, 2014 | Oct. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract] |  |
Development success fee related to purchase recognized as revenues | $ 12.8 | $ 14.3

X
- Definition Development success fees revenue. + References No definition available. + Details
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Namespace Prefix: | agx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration