PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 01, 2018 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
Finite-Lived Intangible Assets
Percentage of contract backlog suspended					90.00%
Intangible Assets - Gross Carrying Amount		$ 11,566	$ 11,566
Accumulated Amortization		5,429	5,429
Finite Lived Intangible Assets - Net Amount		5,956	5,956
Other intangible assets, net		6,137	6,137	$ 7,149
Additions to other intangible assets			0	0
Additions to impairment losses			0	0
Amortization of purchased intangible assets			1,012	1,032	$ 1,163
Indefinite-Lived Intangible Assets
Goodwill		32,838	32,838	34,329	34,913
Goodwill allocated for income tax reporting purposes		$ 16,400	16,400
Period of amortization of goodwill for income tax purpose		15 years
Impairment loss			1,491	584	1,979
APC
Indefinite-Lived Intangible Assets
Impairment loss			0		$ 2,000
TRC
Finite-Lived Intangible Assets
Percentage of average annual growth in revenues over the next seven years	4.9
Expected annual growth in revenues period	7 years
Percentage of average annual growth in earnings before interest and taxes	6.5
Indefinite-Lived Intangible Assets
Goodwill Impairment Loss	$ 1,500			600
GPS
Indefinite-Lived Intangible Assets
Goodwill		$ 18,500	18,500
TRC
Indefinite-Lived Intangible Assets
Goodwill		12,300	12,300
APC
Indefinite-Lived Intangible Assets
Goodwill		2,000	$ 2,000
Trade names | GPS
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			15 years
Finite Lived Intangible Assets - Gross Carrying Amount		3,643	$ 3,643
Accumulated Amortization		2,949	2,949
Finite Lived Intangible Assets - Net Amount		694	$ 694	936
Trade names | TRC
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			15 years
Finite Lived Intangible Assets - Gross Carrying Amount		4,499	$ 4,499
Accumulated Amortization		950	950
Finite Lived Intangible Assets - Net Amount		3,549	$ 3,549	3,849
Process certifications
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			7 years
Finite Lived Intangible Assets - Gross Carrying Amount		1,897	$ 1,897
Accumulated Amortization		858	858
Finite Lived Intangible Assets - Net Amount		1,039	1,039	1,310
Customer relationships
Finite-Lived Intangible Assets
Finite Lived Intangible Assets - Gross Carrying Amount		1,346	1,346
Accumulated Amortization		672	672
Finite Lived Intangible Assets - Net Amount		$ 674	$ 674	$ 873
Customer relationships | Maximum
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			10 years
Customer relationships | Minimum
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets - Estimated Useful Life			4 years