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Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Income Tax Disclosure [Abstract]                      
U.S. income before taxes                 $ 26,299 $ 44,384 $ 34,099
Non-U.S. income before taxes                 25,155 24,741 37,065
Income before income taxes $ 7,097 $ 29,501 $ 9,796 $ 5,060 $ 11,184 $ 33,152 $ 18,013 $ 6,776 $ 51,454 $ 69,125 $ 71,164