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Retirement Plans (Tables)
 3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2013
Compensation and Retirement Disclosure [Abstract]    
Net periodic pension costs (income)
 
Three Months Ended July 31,
 
 
 
 
 
 
 
 
 
Non-Employee Directors
 
Pension Plan
 
VIP Retirement Plan
 
Retirement Plan
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
322

 
325

 
83

 
88

 
4

 
5

Expected return on plan assets
(276
)
 
(245
)
 
—

 
—

 
—

 
—

Settlement cost
—

 
—

 
—

 
—

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Recognized net actuarial loss or (gain)
350

 
360

 
55

 
51

 
(3
)
 
—

Net periodic pension cost (income)
$
396

 
$
440

 
$
138

 
$
139

 
$
1

 
$
5
 
Six Months Ended July 31,
 
 
 
 
 
 
 
 
 
Non-Employee Directors
 
Pension Plan
 
VIP Retirement Plan
 
Retirement Plan
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
644

 
650

 
166

 
176

 
8

 
10

Expected return on plan assets
(552
)
 
(490
)
 
—

 
—

 
—

 
—

Settlement cost
—

 
—

 
—

 
—

 
—

 
—

Amortization of prior service cost
—

 
—

 
—

 
—

 
—

 
—

Recognized net actuarial loss or (gain)
700

 
720

 
110

 
102

 
(6
)
 
—

Net periodic pension cost (income)
$
792

 
$
880

 
$
276

 
$
278

 
$
2

 
$
10