RETIREMENT PLANS (Details) (USD $)	12 Months Ended
	Mar. 31, 2013 Component		Mar. 31, 2012		Mar. 31, 2011
RETIREMENT PLANS [Abstract]
Number of highest consecutive period for service under retirement plans	5 years
Employment period for service under retirement plans	10 years
Defined benefit plan, contributions by plan participants	$ 0
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, with individual service period	65 years
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	42,300,000
Fair value of plan assets at end of year	50,900,000		42,300,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Prepaid pension cost included in pension assets	8,762,000		7,349,000
Assumptions used in estimating the actuarial present value of the projected benefit obligations [Abstract]
Discount rate (in hundredths)	4.50%		5.25%		6.00%
Rate of compensation increases (in hundredths)	5.00%		5.00%		5.00%
Assumptions used in estimating the net periodic (income)/expense [Abstract]
Discount rate (in hundredths)	4.50%		5.25%		6.00%
Expected return on plan assets (in hundredths)	6.50%		6.50%		6.50%
Rate of compensation increases (in hundredths)	5.00%		5.00%		5.00%
Expected Future Benefit Payments [Abstract]
Major components in balanced portfolio	2
Pension plan asset allocation [Abstract]
Asset allocations (in hundredths)	100.00%		100.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, with individual service period	55 years
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, with individual service period	70 years
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	30,100,000		23,800,000
Significant Other Observable Inputs (Level 2) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	20,800,000		18,500,000
Significant Observable Inputs (Level 3) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	0		0
Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Current target allocations range minimum (in hundredths)	60.00%
Current target plan allocations range maximum (in hundredths)	80.00%
Pension plan asset allocation [Abstract]
Asset allocations (in hundredths)	78.80%		77.70%
Fixed Income Securities [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	7,000,000	[1]
Fair value of plan assets at end of year	7,400,000	[1]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Current target allocations range minimum (in hundredths)	15.00%
Current target plan allocations range maximum (in hundredths)	40.00%
Pension plan asset allocation [Abstract]
Asset allocations (in hundredths)	14.50%		16.60%
Fixed Income Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	0	[1]	0	[1]
Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	7,400,000	[1]	7,000,000	[1]
Fixed Income Securities [Member] | Significant Observable Inputs (Level 3) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	0	[1]	0	[1]
Cash and Cash Equivalents [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	2,400,000
Fair value of plan assets at end of year	3,400,000
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Current target allocations range minimum (in hundredths)	0.00%
Current target plan allocations range maximum (in hundredths)	15.00%
Pension plan asset allocation [Abstract]
Asset allocations (in hundredths)	6.70%		5.70%
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	3,400,000		2,400,000
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	0		0
Cash and Cash Equivalents [Member] | Significant Observable Inputs (Level 3) [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at end of year	0		0
Qualified Plan [Member]
Net pension benefit [Abstract]
Service cost-benefits earned during the year	259,672		133,729		161,047
Interest cost on projected benefit obligation	286,639		256,558		231,332
Expected return on assets	(784,194)		(781,299)		(771,025)
Net amortization	49,803		9,377		9,377
Net pension benefit from qualified plan	(188,080)		(381,635)		(369,269)
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	5,136,555		4,213,349		3,450,443
Service cost	259,672		133,729		161,047
Interest cost	286,639		256,558		231,332
Actuarial gain (loss)	818,784		601,402		437,959
Benefits paid	(80,039)		(68,483)		(67,432)
Benefit obligation at end of year	6,421,611		5,136,555		4,213,349
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	12,485,876	[2]	11,610,994		10,519,400
Actual return on plan assets	2,777,996		943,365		1,159,026
Benefits paid	(80,039)		(68,483)		(67,432)
Fair value of plan assets at end of year	15,183,833	[2]	12,485,876	[2]	11,610,994
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Actuarial present value of benefit obligations: Accumulated benefit obligation	(5,636,366)		(4,755,675)
Projected benefit obligation for service rendered to date	(6,421,611)		(5,136,555)		(4,213,349)
Funded status	8,762,222		7,349,321
Unrecognized net (gain) loss from past experience different from that assumed and effects of changes in assumptions	602,598		1,818,042
Unrecognized prior service costs	122,579		131,956
ASC 715 adjustment	(725,177)		(1,949,998)
Prepaid pension cost included in pension assets	8,762,222		7,349,321
Shares in CSC (in shares)	25,000		25,000
Expected Future Benefit Payments [Abstract]
2014	222,000
2015	238,000
2016	250,000
2017	334,000
2018	338,000
2019-2023	1,921,000
Plan assets managed by trustee (in hundredths)	15.00%
Restoration Plan [Member]
Net pension benefit [Abstract]
Service cost-benefits earned during the year	37,052		18,163		33,216
Interest cost on projected benefit obligation	106,939		79,056		69,248
Net amortization	9,731		(15,428)		(24,507)
Net pension benefit from qualified plan	153,722		81,791		77,957
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	1,568,392		1,256,895		1,082,941
Service cost	37,052		18,163		33,216
Interest cost	106,939		79,056		69,248
Actuarial gain (loss)	810,303		214,278		132,940
Other adjustments	127,280		0		(61,450)
Benefit obligation at end of year	2,649,966		1,568,392		1,256,895
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Projected benefit obligation for service rendered to date	(2,649,966)		(1,568,392)		(1,256,895)
Unrecognized net (gain) loss from past experience different from that assumed and effects of changes in assumptions	836,122		8,556
Unrecognized prior service costs	(122,296)		(130,798)
ASC 715 adjustment	(713,826)		122,242
Accrued pension cost included in pension liabilities	(2,649,966)		(1,568,392)
Expected Future Benefit Payments [Abstract]
2014	100,000
2015	119,000
2016	134,000
2017	181,000
2018	183,000
2019-2023	$ 965,000

[1] This category includes investments in investment grade fixed income instruments, primarily U.S. government obligations.

[2] Primarily equities and bonds including approximately 25,000 shares of CSW Common Stock.