Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Schedule of income taxes provision / (benefit) for continuing operations by applying U.S. federal statutory rate
Provision for income taxes at the U.S. statutory rate	$ 14,248	$ 18,009	$ 24,194
Lower effective non-U.S. income tax rate	(4,378)	(4,725)	(4,463)
Change in valuation allowance	136	828	986
U.S. tax provided on earnings of non-U.S. subsidiaries		541	1,029
Change in liabilities for uncertain tax positions, net	(381)	215	(98)
State and local taxes, net of federal benefit	626	617	1,234
Impact of 2017 Tax Act	45,002
Excess tax deficiencies from stock-based compensation	1,094
Non-deductible acquisition costs	786
Other, net	234	830	478
Provision for income taxes	$ 57,367	$ 16,315	$ 23,360