Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Apr. 30, 2013	Jul. 31, 2012
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) related to unrealized gains (losses)	$ 24	$ 24
Reclassified from accumulated other comprehensive income (loss)	$ 38

Accumulative Other Comprehensive Income Loss Unrealized Gain Loss On Foreign Currency Translation

No definition available.

Name:	alog_AccumulativeOtherComprehensiveIncomeLossUnrealizedGainLossOnForeignCurrencyTranslation
Namespace Prefix:	alog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant