EMPLOYEE BENEFIT PLANS, Plan assets (Details) (USD $)	12 Months Ended
	Jan. 31, 2013		Jan. 31, 2012		Jan. 31, 2011	Jan. 31, 2007
Asset allocation [Abstract]
Aggregate benefit obligation payable	$ 27,046,669		$ 26,059,763		$ 20,675,319
Defined Contribution Plan: [Abstract]
Service requirement for participation in defined contribution plan	6 months					1 year
Minimum age requirement for benefit contribution	21 years
Employee contribution percent maximum (in hundredths)	25.00%
Discretionary contribution to eligible new hires, maximum (in hundredths)	2.00%
Employer discretionary contribution	799,730		780,673		709,470
Less than five years of service [Member]
Defined Contribution Plan: [Abstract]
Minimum number of years of service	5 years
Five to nine years of service [Member]
Defined Contribution Plan: [Abstract]
Minimum number of years of service	5 years
Maximum number of years of service	9 years
Ten years or more [Member]
Defined Contribution Plan: [Abstract]
Minimum number of years of service	10 years
Less than 45 years old [Member] | Less than five years of service [Member]
Defined Contribution Plan: [Abstract]
Maximum employer matching percentage contribution (in hundredths)	2.00%
45 years and older [Member] | Five to nine years of service [Member]
Defined Contribution Plan: [Abstract]
Maximum employer matching percentage contribution (in hundredths)	3.00%
45 years and older [Member] | Ten years or more [Member]
Defined Contribution Plan: [Abstract]
Maximum employer matching percentage contribution (in hundredths)	4.00%
Defined Benefit Plans [Member]
Asset allocation [Abstract]
Actual plan asset allocations percentages (in hundredths)	100.00%		100.00%
Total pension assets	18,189,051		16,343,172
Defined Benefit Plans [Member] | Level 1 [Member]
Asset allocation [Abstract]
Total pension assets	18,189,051		16,343,172
Defined Benefit Plans [Member] | Level 2 [Member]
Asset allocation [Abstract]
Total pension assets	0
Defined Benefit Plans [Member] | Level 3 [Member]
Asset allocation [Abstract]
Total pension assets	0		0
Defined Benefit Plans [Member] | Equity Securities [Member]
Target allocation [Abstract]
Target allocation percentages	40-80 %		40-80 %
Defined Benefit Plans [Member] | Equity Securities [Member] | Minimum [Member]
Asset allocation [Abstract]
Actual plan asset allocations percentages (in hundredths)	61.00%		61.00%
Defined Benefit Plans [Member] | Equity Securities [Member] | Maximum [Member]
Asset allocation [Abstract]
Actual plan asset allocations percentages (in hundredths)	77.00%		77.00%
Defined Benefit Plans [Member] | Debt Securities [Member]
Target allocation [Abstract]
Target allocation percentages	20-60 %		20-60 %
Defined Benefit Plans [Member] | Debt Securities [Member] | Minimum [Member]
Asset allocation [Abstract]
Actual plan asset allocations percentages (in hundredths)	23.00%		23.00%
Defined Benefit Plans [Member] | Debt Securities [Member] | Maximum [Member]
Asset allocation [Abstract]
Actual plan asset allocations percentages (in hundredths)	39.00%		39.00%
Defined Benefit Plans [Member] | Domestic Equities [Member]
Asset allocation [Abstract]
Total pension assets	8,219,452	[1]	7,162,837	[1]
Defined Benefit Plans [Member] | Domestic Equities [Member] | Level 1 [Member]
Asset allocation [Abstract]
Total pension assets	8,219,452	[1]	7,162,837	[1]
Defined Benefit Plans [Member] | Domestic Equities [Member] | Level 2 [Member]
Asset allocation [Abstract]
Total pension assets	0	[1]	0	[1]
Defined Benefit Plans [Member] | Domestic Equities [Member] | Level 3 [Member]
Asset allocation [Abstract]
Total pension assets	0	[1]	0	[1]
Defined Benefit Plans [Member] | Foreign Equities [Member]
Asset allocation [Abstract]
Total pension assets	2,938,729	[1]	2,839,026	[1]
Defined Benefit Plans [Member] | Foreign Equities [Member] | Level 1 [Member]
Asset allocation [Abstract]
Total pension assets	2,938,729	[1]	2,839,026	[1]
Defined Benefit Plans [Member] | Foreign Equities [Member] | Level 2 [Member]
Asset allocation [Abstract]
Total pension assets	0	[1]	0	[1]
Defined Benefit Plans [Member] | Foreign Equities [Member] | Level 3 [Member]
Asset allocation [Abstract]
Total pension assets	0	[1]	0	[1]
Defined Benefit Plans [Member] | Intermediate Duration Corporate and Government Bonds [Member]
Asset allocation [Abstract]
Total pension assets	5,587,829	[2]	5,468,502	[2]
Defined Benefit Plans [Member] | Intermediate Duration Corporate and Government Bonds [Member] | Level 1 [Member]
Asset allocation [Abstract]
Total pension assets	5,587,829	[2]	5,468,502	[2]
Defined Benefit Plans [Member] | Intermediate Duration Corporate and Government Bonds [Member] | Level 2 [Member]
Asset allocation [Abstract]
Total pension assets	0	[2]	0	[2]
Defined Benefit Plans [Member] | Intermediate Duration Corporate and Government Bonds [Member] | Level 3 [Member]
Asset allocation [Abstract]
Total pension assets	0	[2]	0	[2]
Defined Benefit Plans [Member] | Cash and Cash Equivalents [Member]
Asset allocation [Abstract]
Total pension assets	1,443,041	[3]	872,807	[3]
Defined Benefit Plans [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Asset allocation [Abstract]
Total pension assets	1,443,041	[3]	872,807	[3]
Defined Benefit Plans [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
Asset allocation [Abstract]
Total pension assets	0	[3]	0	[3]
Defined Benefit Plans [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]
Asset allocation [Abstract]
Total pension assets	0	[3]	0	[3]
Directors' Benefit Plan [Member]
Asset allocation [Abstract]
Aggregate benefit obligation payable	503,149		561,061
Aggregate current benefit obligation payable	79,000		79,000
Aggregate non-current obligation payable	$ 424,149		$ 482,061

[1] These categories consist of various managed funds that invest primarily in common stocks, as well as other equity securities and a combination of other funds.

[2] Investments in this category consist of a fixed income fund that invests primarily in intermediate duration bonds, as well as a combination of other funds.

[3] Cash is comprised of money market funds, which are valued utilizing the net asset value per unit based on the fair value of the underlying assets as determined by the fund's investment managers.