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Location of Restructuring Charges Classified on Consolidated Balance Sheets (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Jul. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges $ 0.9us-gaap_RestructuringReserve $ 1.6us-gaap_RestructuringReserve $ 3.8us-gaap_RestructuringReserve
Accrued Restructuring Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 0.8us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= alog_AccruedRestructuringChargesMember		   3.4us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= alog_AccruedRestructuringChargesMember
Other long-term liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges $ 0.1us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		   $ 0.4us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember