Unrecognized Tax benefit (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012
Schedule of Unrecognized Tax Benefits [Line Items]
Gross Amount Of Unrecognized Tax Benefits Excluding Interest And Penalties Pertaining To Uncertain Tax Positions	$ 6,833	$ 6,756

Gross Amount Of Unrecognized Tax Benefits Excluding Interest And Penalties Pertaining To Uncertain Tax Positions

No definition available.

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Namespace Prefix:	alog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant