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Pension And Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Mar. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Assumptions Used To Compute Net Periodic Benefit Cost And Benefit Obligations
 
Pension Benefits
 
Other Postretirement Benefits
 
2013
  
2012
  
2011
 
2013
  
2012
  
2011
Discount rates:
 
  
 
  
 
 
 
  
 
  
 
Benefit cost for plan year
4.60
%
  
5.50
%
  
6.00
%
 
4.40
%
  
5.50
%
  
6.00
%
Benefit obligation at end of plan year
4.20
%
  
4.60
%
  
5.50
%
 
3.90
%
  
4.40
%
  
5.50
%
Expected long-term return on plan assets:
 
 
 
 
 
 
 
 
 
 
 
Benefit cost for plan year
8.00
%
  
8.00
%
  
8.00
%
 
4.30
%
  
4.30
%
  
4.30
%
Benefit obligation at end of plan year
8.00
%
 
8.00
%
 
8.00
%
 
4.30
%
 
4.30
%
 
4.30
%
Salary scale
5.00
%
  
5.00
%
  
5.00
%
 
5.00
%
  
5.00
%
  
5.00
%
Healthcare cost trend rate
N/A

  
N/A

  
N/A

 
7.60
%
  
7.80
%
  
8.00
%
Benefit Obligations, Plan Assets, And Funded Status
 
Pension Benefits
  
Other Postretirement Benefits
 
March 31,
 
March 31,
 
2013
 
2012
 
2013
 
2012
Actuarial present value of benefit obligation:
 
 
 
 
 
 
 
Accumulated benefit obligation
$
280,626

  
$
278,128

 
$
—

 
$
—

Projected benefit obligation
299,161

  
302,632

 
48,970

 
48,784

 
 
 
 
 
 
 
 
Change in projected benefit obligation:
 
 
 
 
 
 
 
Projected benefit obligation, beginning of year
$
302,632

 
$
262,085

 
$
48,784

 
$
43,888

Service cost
4,650

 
4,614

 
467

 
591

Interest cost
13,001

 
13,959

 
2,303

 
2,636

Effect of discount rate change
13,798

 
34,292

 
3,068

 
5,205

Foreign currency exchange rate changes
(1,528
)
 
(1,733
)
 
—

 
—

Settlements
(13,027
)
 
—

 
—

 
—

Other
(6,420
)
 
5,975

 
(2,733
)
 
529

Benefit payments
(13,945
)
 
(16,560
)
 
(2,919
)
 
(4,065
)
Projected benefit obligation, end of year
$
299,161

 
$
302,632

 
$
48,970

 
$
48,784

 
 
 
 
 
 
 
 
Change in plan assets:
 
 
 
 
 
 
 
Plan assets at fair value, beginning of year
$
199,525

 
$
195,715

 
$
3,062

 
$
3,284

Actual return on plan assets
22,865

 
15,451

 
151

 
146

Employer contributions
11,552

 
6,259

 
2,638

 
3,697

Settlements
(13,027
)
 
—

 
—

 
—

Foreign currency exchange rate changes
(1,028
)
 
(1,340
)
 
—

 
—

Benefit payments
(13,945
)
 
(16,560
)
 
(2,919
)
 
(4,065
)
Plan assets at fair value, end of year
$
205,942

 
$
199,525

 
$
2,932

 
$
3,062

 
 
 
 
 
 
 
 
Funded status:
 
 
 
 
 
 
 
Funded status of the plans, end of year
$
(93,219
)
  
$
(103,107
)
  
$
(46,038
)
 
$
(45,722
)
Funded Status In Consolidated Balance Sheets
 
Pension Benefits
 
Other Postretirement Benefits
 
March 31,
 
March 31,
 
2013
 
2012
 
2013
 
2012
Non-current asset (included in other noncurrent assets)
$
1,280

 
$
1,424

 
$
—

 
$
—

Current liability (included in accounts payable and accrued expenses)
(1,581
)
 
(6,511
)
 
(3,327
)
 
(3,213
)
Non-current liability (reported as pensions and other postretirement benefits)
(92,918
)
 
(98,020
)
 
(42,711
)
 
(42,509
)
Amounts recognized in the consolidated balance sheets
$
(93,219
)
 
$
(103,107
)
 
$
(46,038
)
 
$
(45,722
)
Additional Information On Funded Status
 
Pension Benefits
 
Other Postretirement Benefits
 
March 31,
 
March 31,
 
2013
 
2012
 
2013
 
2012
For plans with a projected benefit obligation in excess of plan assets:
 
 
 
 
 
 
 
Aggregate projected benefit obligation (PBO)
$
290,142

 
$
294,325

 
$
48,970

 
$
48,784

Aggregate fair value of plan assets
195,642

 
189,795

 
2,932

 
3,062

For plans with an accumulated benefit obligation in excess of plan assets:
 
 
 
 
 
 
 
Aggregate accumulated benefit obligation (ABO)
272,148

 
270,569

 
N/A

 
N/A

Aggregate fair value of plan assets
195,642

 
189,795

 
N/A

 
N/A
Components Of Company's Net Periodic Benefit Cost
 
Pension Benefits
 
Other Postretirement Benefits
 
Fiscal Year Ended March 31,
 
Fiscal Year Ended March 31,
 
2013
 
2012
 
2011
 
2013
 
2012
 
2011
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
4,650

 
$
4,614

 
$
4,835

 
$
467

 
$
591

 
$
787

Interest cost
13,001

 
13,959

 
14,168

 
2,303

 
2,636

 
2,534

Expected return on plan assets
(14,632
)
 
(14,958
)
 
(14,938
)
 
(124
)
 
(134
)
 
(144
)
Curtailment loss
—

 
—

 
966

 
—

 
—

 
—

Settlement cost
3,304

 
—

 
3,119

 
—

 
—

 
—

Net amortization and deferral
10,299

 
6,309

 
3,937

 
(8
)
 
(335
)
 
(253
)
Net periodic benefit cost
$
16,622

 
$
9,924

 
$
12,087

 
$
2,638

 
$
2,758

 
$
2,924
Recognized In Accumulated Other Comprehensive Income (Loss) On Pretax Basis
 
Pension Benefits
 
Other Postretirement Benefits
 
March 31,
 
March 31,
 
2013
 
2012
 
2013
 
2012
Change in net actuarial loss (gain):
 
 
 
 
 
 
 
Net actuarial loss (gain), beginning of year
$
108,171

 
$
75,138

 
$
(4,644
)
 
$
(6,722
)
Losses (gains) arising during the year
(928
)
 
39,461

 
717

 
1,475

Reclassification adjustments during the year
(13,886
)
 
(6,428
)
 
9

 
603

Net actuarial loss (gain), end of year
93,357

 
108,171

 
(3,918
)
 
(4,644
)
 
 
 
 
 
 
 
 
Change in prior service cost (benefit):
 
 
 
 
 
 
 
Prior service cost (benefit), beginning of year
(3,080
)
 
(3,393
)
 
500

 
—

   Prior service cost arising during the year
—

 
—

 
—

 
750

Reclassification adjustments during the year
463

 
313

 
(274
)
 
(250
)
Prior service cost (benefit), end of year
(2,617
)
 
(3,080
)
 
226

 
500

Total amounts in accumulated other comprehensive loss
at end of year, before income taxes
$
90,740

 
$
105,091

 
$
(3,692
)
 
$
(4,144
)
Weighted-Average Target Pension Asset Allocation And Target Ranges By Major Asset Category
 
 
 
 
 
 
 
Actual Allocation
 
Target Allocation
 
 
 
 
 
March 31,
Major Asset Category
 
Range
 
2013
 
2012
Domestic equity securities
44.0
%
 
37
%
-
51%
 
44.3
%
 
45.5
%
International equity securities
13.0
%
 
10
%
-
16%
 
12.7
%
 
12.1
%
Fixed income securities (1) 
33.0
%
 
26
%
-
40%
 
32.6
%
 
32.3
%
Alternative investments:
 
 
 
 
 
 
 
 
 
Real estate funds
5.0
%
 
3
%
-
7%
 
5.6
%
 
5.4
%
Hedge funds
5.0
%
 
3
%
-
7%
 
4.8
%
 
4.7
%
Total
100.0
%
 
 
 
 
 
100.0
%
 
100.0
%
Estimated Future Benefit Payments
Fiscal Year:
Pension
Benefits
 
Other
Postretirement
Benefits
2014
$
15,967

 
$
3,371

2015
19,966

 
3,397

2016
17,787

 
3,398

2017
19,699

 
3,409

2018
16,015

 
3,321

2019 - 2023
97,776

 
15,977
Fair Values Of The Assets Under Fair Value Hierarchy
 
March 31, 2013
 
Level 1
 
Level 2
 
Level 3
 
Total
Domestic equity securities
$
83,233

 
$
—

 
$
—

 
$
83,233

International equity securities
23,931

 
—

 
—

 
23,931

Fixed income securities (1) 
61,553

 
10,300

 
7,435

 
79,288

Alternative investments:
 
 
 
 
 
 
 
Real estate fund
—

 
—

 
8,933

 
8,933

Hedge fund
—

 
—

 
10,557

 
10,557

Total investments
$
168,717

 
$
10,300

 
$
26,925

 
$
205,942


 
March 31, 2012
 
Level 1
 
Level 2
 
Level 3
 
Total
Domestic equity securities
$
26,025

 
$
55,420

 
$
—

 
$
81,445

International equity securities
20,935

 
—

 
—

 
20,935

Fixed income securities (1) 
21,470

 
51,708

 
6,083

 
79,261

Alternative investments:
 
 
 
 
 
 
 
Real estate fund
—

 
—

 
8,358

 
8,358

Hedge fund
—

 
—

 
9,526

 
9,526

Total investments
$
68,430

 
$
107,128

 
$
23,967

 
$
199,525