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Accumulated Other Comprehensive Income - Component of Accumulated Other Comprehensive Income (loss) (Details) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]      
Foreign currency translation adjustments $ 80,808 $ 100,190 $ 76,569
Available-for-sale securities 119 191 197
Hedging contracts   (38) 14
Unrecognized prior service cost related to defined benefit pension plan (420)    
Total accumulated other comprehensive loss $ 80,507 $ 100,343 $ 76,780