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Revision of Prior Period Financial Statements (Tables)
 6 Months Ended
Sep. 30, 2012
Accounting Changes and Error Corrections [Abstract]  
Revision of Prior Period Financial Statements
 
For the Three Months Ended,
 
For the Six Months Ended,
 
October 2, 2011
 
October 2, 2011
(in thousands, except per share amounts)
As
Reported (1)
Adjustments
As
 Revised
 
As
Reported (1)
Adjustments
As
 Revised
Consolidated Statement of Operations
 
 
 
 
 
 
 
Cost of revenues
$
64,015

$
670

$
64,685

 
$
131,584

$
2,950

$
134,534

Gross profit
74,303

(670
)
73,633

 
156,019

(2,950
)
153,069

Research and development
39,567

(383
)
39,184

 
79,234

(235
)
78,999

Selling, general and administrative
24,868

20

24,888

 
50,716

101

50,817

Total operating expenses
64,435

(363
)
64,072

 
129,950

(134
)
129,816

Operating income
9,868

(307
)
9,561

 
26,069

(2,816
)
23,253

Income from continuing operations
   before income taxes
8,040

(307
)
7,733

 
24,285

(2,816
)
21,469

Provision (benefit) for income taxes
(367
)
—

(367
)
 
580

20

600

Net income from continuing operations
8,407

(307
)
8,100

 
23,705

(2,836
)
20,869

Net income
$
47,054

$
(307
)
$
46,747

 
$
54,737

$
(2,836
)
$
51,901

 
 
 
 
 
 
 
 
Basic income (loss) per share:
 
 
 
 
 
 
 
    Continuing operations
$
0.06

$
—

$
0.06

 
$
0.16

$
(0.02
)
$
0.14

    Net income (loss)
$
0.33

$
(0.01
)
$
0.32

 
$
0.37

$
(0.02
)
$
0.35

 
 
 
 
 
 
 
 
Diluted net income (loss) per share:
 
 
 
 
 
 
 
    Continuing operations
$
0.06

$
—

$
0.06

 
$
0.16

$
(0.02
)
$
0.14

    Net income (loss)
$
0.32

$
—

$
0.32

 
$
0.37

$
(0.02
)
$
0.35

 
 
 
 
 
 
 
 
1) Reflects previously reported amounts as adjusted for discontinued operations (see Note 5)