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INCOME TAXES - Reconciliation of Expected Income Tax Expense to Actual Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
INCOME TAXES
Computed "expected" income tax	$ 38,078	$ 40,086	$ 26,427
State income taxes, net of federal benefit	5,042	4,001	4,030
Domestic production activities deduction	(3,204)	(2,906)	(1,635)
Stock option exercises	(962)	(4,969)
Exclusion of non-controlling interests	(113)	(2,484)	(4,823)
Other permanent differences, net	1,254	1,933	1,557
Impact of federal tax rate change on deferred taxes	(789)
Adjustments and other differences	973	1,445	(254)
Income tax expense	$ 40,279	$ 37,106	$ 25,302

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to stock option exercises

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

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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