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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2017	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Federal corporate income tax rate	35.00%	33.81%	35.00%	35.00%
Income tax expense (benefit)		$ 40,279	$ 37,106	$ 25,302
Prepaid income taxes		7,900	3,900
Research and development
Income tax expense (benefit)		$ 0	$ 0	$ 0

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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