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PURCHASED INTANGIBLE ASSETS - Changes in the balances of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 27,943	$ 32,838	$ 34,329
Impairment loss	0	(4,895)	(1,491)
Goodwill, Ending Balance	27,943	27,943	32,838
GPS
Goodwill [Roll Forward]
Goodwill, Beginning Balance	18,476	18,476	18,476
Impairment loss	0		0
Goodwill, Ending Balance	18,476	18,476	18,476
TRC
Goodwill [Roll Forward]
Goodwill, Beginning Balance	9,467	12,290	13,781
Impairment loss	0	(2,823)	(1,491)
Goodwill, Ending Balance	9,467	9,467	12,290
APC
Goodwill [Roll Forward]
Goodwill, Beginning Balance		2,072	2,072
Impairment loss	$ 0	$ (2,072)	0
Goodwill, Ending Balance			$ 2,072

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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X

- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

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+ References

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