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Income taxes (Tables)
 12 Months Ended
Mar. 31, 2013
Income taxes [Abstract]  
Components of income before income tax expense
The components of income before income tax expense were:

(In thousands)
Years ended March 31,
 
2013
 
 
2012
 
 
2011
 
U.S.
 
$
(21,334
)
 
$
325,882
 
 
$
330,511
 
Foreign
 
 
(23,524
)
 
 
911,806
 
 
 
1,007,225
 
Income before income tax expense 
 
$
(44,858
)
 
$
1,237,688
 
 
$
1,337,736
 
Components of provision for income taxes
The provision for income taxes consists of the following:

(In thousands)
Years ended March 31,
 
2013
 
 
2012
 
 
2011
 
Current:
 
 
 
 
 
 
 
 
 
   U.S. federal
 
$
20,134
 
 
$
222,012
 
 
$
162,020
 
   State and local
 
 
(8,258
)
 
 
26,984
 
 
 
23,574
 
   Foreign
 
 
10,176
 
 
 
52,452
 
 
 
56,866
 
 
 
22,052
 
 
 
301,448
 
 
 
242,460
 
Deferred:
 
 
 
 
 
 
 
 
 
 
 
 
   U.S.
 
 
(33,959
)
 
 
(41,970
)
 
 
45,997
 
   Foreign
 
 
(848
)
 
 
(848
)
 
 
2,509
 
 
 
(34,807
)
 
 
(42,818
)
 
 
48,506
 
 
$
(12,755
)
 
$
258,630
 
 
$
290,966
 
Reconciliation between provision for income taxes and expected federal income taxes at statutory rate
The reasons for the difference between the provision for income taxes and expected federal income taxes at statutory rates are as follows:

Years ended March 31, (percentage of income
before income tax expense)                              
 
2013
 
 
2012
 
 
2011
 
U.S. statutory rate
 
 
35.0
%
 
 
35.0
%
 
 
35.0
%
Effect of foreign operations
 
 
(88.8
)
 
 
(16.1
)
 
 
(17.9
)
Research credit
 
 
46.0
 
 
 
(1.0
)
 
 
(1.0
)
State and local taxes, less federal tax benefit
 
 
(16.9
)
 
 
1.4
 
 
 
1.1
 
Unrecognized tax benefit - audit settlement and statute expiration54.70.00.0
Government investigation
 
 
0.0
 
 
 
0.0
 
 
 
2.1
 
Permanent differences and other items
 
 
(1.6
)
 
 
1.6
 
 
 
2.5
 
 
 
28.4
%
 
 
20.9
%
 
 
21.8
%
Schedule of net deferred income taxes
Net deferred income taxes relate to the following timing differences:

(In thousands)
March 31,
 
2013
 
 
2012
 
Inventory reserves
 
$
42,924
 
 
$
42,121
 
Receivable allowances and other reserves
 
 
37,169
 
 
 
33,912
 
Property, plant and equipment
 
 
(24,302
)
 
 
(12,759
)
Intangible assets
 
 
(255,260
)
 
 
(278,853
)
Carryforwards and credits
 
 
64,378
 
 
 
57,740
 
Accrued liabilities
 
 
65,193
 
 
 
56,821
 
Employee stock option tax benefits
 
 
41,726
 
 
 
39,953
 
Other (includes reserve for legal contingencies)
 
 
21,169
 
 
 
29,398
 
 
 
(7,003
)
 
 
(31,667
)
Valuation allowance
 
 
(9,787
)
 
 
(11,875
)
Deferred taxes, net
 
$
(16,790
)
 
$
(43,542
)
Reconciliation of beginning and ending amount of unrecognized tax benefits
As of March 31, 2013 the Company's Consolidated Balance Sheet reflects unrecognized tax benefits (UTBs) of $492.1 million of which $466.0 million would impact the effective tax rate if recognized.  A reconciliation of the beginning and ending amount of UTBs is as follows:

(In thousands)
 
2013
 
 
2012
 
Balance at beginning of period
 
$
498,292
 
 
$
426,398
 
Additions related to prior year positions
 
 
2,011
 
 
 
5,406
 
Reductions related to prior year positions
 
 
(1,630
)
 
 
(874
)
Reduction related to audit settlement
 
 
(7,806
)
 
 
(13,177
)
Reduction related to statute expiration
 
 
(11,500
)
 
 
( 6,530
)
Additions related to current year positions
 
 
12,721
 
 
 
87,069
 
Balance as of March 31
 
$
492,088
 
 
$
498,292