SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Inventories
Raw materials	$ 9,870	$ 9,074
Work-in-process	6,269	4,355
Finished goods	3,732	4,108
Total inventories	19,871	17,537
Property, Plant and Equipment
Property and Equipment, gross	229,649	194,568
Accumulated Depreciation and Amortization	(140,560)	(117,017)
Property and Equipment, net	89,089	77,551
Depreciation [Abstract]
Depreciation Expense	26,000	25,200	$ 20,300
Other Assets [Abstract]
Long-term restricted cash and time deposits	28,402	54,566
Deferred debt issuance costs, net	3,668	1,929
Long-term security deposits	4,139	4,123
Other	15,828	16,002
Total other assets	52,037	76,620
Accounts Payable and Accrued Liabilities, Current [Abstract]
Compensation and benefits	83,216	73,998
Billings in excess of costs and estimated earnings on uncompleted contracts	46,062	59,810
Income taxes	14,464	11,410
Contingent consideration - current portion	13,187	9,725
Distributor and agent commissions	12,255	10,384
Taxes other than income taxes	11,424	8,564
Professional and consulting fees	8,752	8,020
Other	30,905	31,313
Total accrued expenses and other current liabilities	220,265	213,224
Other Liabilities [Abstract]
Unrecognized tax benefits, including interest and penalties	41,014	28,204
Contingent consideration - long-term portion	49,149	42,708
Deferred rent expense	12,168	13,805
Obligations for severance compensation	3,028	2,880
Capital lease obligations - long-term portion	3,315	68
Other	5,791	6,694
Total other liabilities	114,465	94,359
Other income (expense), net:
Foreign currency gains (losses), net	6,760	(2,743)	(8,037)
(Losses) gains on derivative financial instruments, net	(17)	(322)	394
Other, net	(841)	(3,861)	(4,634)
Total other income (expense), net	5,902	(6,926)	(12,277)
Supplemental information regarding consolidated cash flows
Cash paid for interest	24,402	21,892	20,734
Cash payments of income taxes, net	23,450	29,582	17,165
Non-cash investing and financing transactions:
Liabilities for contingent consideration in business combinations	27,605	26,400	16,238
Capital leases of property and equipment	4,350	151	0
Accrued but unpaid purchases of property and equipment	2,367	2,868	4,562
Inventory transfers to property and equipment	437	552	1,142
Leasehold improvements funded by lease incentives	0	82	$ 1,721
Land and buildings
Property, Plant and Equipment
Property and Equipment, gross	10,276	9,543
Leasehold Improvements
Property, Plant and Equipment
Property and Equipment, gross	29,793	29,247
Software
Property, Plant and Equipment
Property and Equipment, gross	54,032	61,810
Equipment, Furniture and Other
Property, Plant and Equipment
Property and Equipment, gross	$ 135,548	$ 93,968