Equity Incentive Plans (Details) (USD $)	12 Months Ended
Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2009
Stock-based compensation expense [Line Items]
Allocated share based compensation expense	$ 32,319,000	$ 32,215,000	$ 27,204,000
Amount of share-based compensation expense capitalized to inventory	7,100,000	7,000,000	6,700,000
Amount of capitalized inventory sold	6,800,000	7,100,000	5,800,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remained available for future grant under the plan (in shares)	6,700,000
Term of equity incentives granted (in years)	10
Exercisable rate of equity incentives granted (in hundredths)	25.00%
Vesting period related to equity incentives granted for newly hired employees (in years of service)	1
Exercise period related to equity incentives granted to newly hired employees on monthly or quarterly basis (in months)	36
Exercise period related to subsequent equity incentives granted to existing employees on monthly or quarterly basis, lower range (in months)	48
Exercise period related to subsequent equity incentives granted to existing employees on monthly or quarterly basis, upper range (in months)	60
Exercise period, beginning 2008, related to equity incentives granted to employees on quarterly basis (in months)	48
Common stock shares reserved for issuance since the inception of the plans (in shares)	106,215,611
Amount of unearned share-based compensation estimated to be expensed related to unvested share-based payment awards	62,200,000
Weighted average period of unearned share-based compensation expected to be recognized (in years)	2.20
Restricted stock units share activity under stock incentive plans [Rollforward]
Restricted stock units, beginning (in shares)	4,637,948	3,601,772	2,464,565
Granted (in shares)	1,766,257	1,846,241	1,876,738
Forfeit/expired (in shares)	(171,967)	(120,198)	(293,573)
Vested (in shares)	(990,932)	(689,867)	(445,958)
Restricted stock units, ending (in shares)	5,241,306	4,637,948	3,601,772
Total intrinsic value of restricted stock units vested	32,600,000	17,500,000	12,400,000
Total intrinsic value of restricted stock units outstanding	199,200,000
Closing price of company's common stock (dollars per share)	$ 38.01
Weighted average fair values per share of restricted stock units awarded (amount per share)	$ 26.05	$ 20.75	$ 22.11
Restricted stock units' weighted average remaining expense recognition period (in years)	2.25
Option activity under stock incentive plans [Roll Forward]
Outstanding stock options, beginning (in shares)	8,459,779	10,081,533	11,732,385
Granted (in shares)		12,000	24,000
Exercised (in shares)	(2,885,365)	(1,492,866)	(1,573,183)
Canceled (in shares)	(77,490)	(140,888)	(101,669)
Outstanding stock options, ending (in shares)	5,496,924	8,459,779	10,081,533
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average exercise price, beginning of period	$ 24.52	$ 24.20	$ 23.14
Granted		$ 27.03	$ 33.90
Exercised	$ 23.09	$ 22.03	$ 16.33
Canceled	$ 29.39	$ 27.79	$ 26.27
Weighted average exercise price, end of period	$ 25.21	$ 24.52	$ 24.20
Schedule of assumptions used in estimating weighted average fair value [Abstract]
Expected term (in years)		6.50	6.50
Volatility (in hundredths)		36.00%	43.00%
Risk-free interest rate (in hundredths)		2.57%	3.14%
Dividend yield (in hundredths)		5.00%	4.00%
Total intrinsic value of options exercised related to stock incentive plans	29,800,000	7,600,000	22,300,000
Aggregate intrinsic value of options outstanding related to stock incentive plans	70,400,000
Aggregate intrinsic value of options exercisable related to stock incentive plans	70,400,000
Closing price of company's common stock related to calculation of aggregate intrinsic value of stock options (in dollars per share)	$ 38.01
Exercisable number of option shares (in shares)	5,491,363	8,433,445
Weighted average exercise price per share of exercisable options (in dollars per share)	$ 25.20	$ 24.49
Weighted average fair values per share of stock options granted (in dollars per share)		$ 5.90	$ 10.39
Cost of sales [Member]
Stock-based compensation expense [Line Items]
Allocated share based compensation expense	6,825,000	7,054,000	5,845,000
Research and development [Member]
Stock-based compensation expense [Line Items]
Allocated share based compensation expense	12,874,000	12,194,000	10,866,000
Selling, general and administrative [Member]
Stock-based compensation expense [Line Items]
Allocated share based compensation expense	17,113,000	17,530,000	15,770,000
Pre-tax effect of share based compensation [Member]
Stock-based compensation expense [Line Items]
Allocated share based compensation expense	36,812,000	36,778,000	32,481,000
Income tax benefit [Member]
Stock-based compensation expense [Line Items]
Allocated share based compensation expense	$ (4,493,000)	$ (4,563,000)	$ (5,277,000)

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Percentage of an award that are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale.

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Previous exercise period of time (upper range) over which an existing employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The weighted average period over which unrecognized share-based compensation costs for restricted stock awards and restricted stock units are expected to be reported.

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The number of shares remained available for future issuance under the deferred compensation arrangement as of the balance sheet date.

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The intrinsic value of share-based payment equity instruments, excluding stock options, outstanding during the reporting period as calculated by applying the disclosed pricing methodology.

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The intrinsic value of share-based payment equity instruments, excluding stock options, that vested during the reporting period as calculated by applying the disclosed pricing methodology.

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Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).

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The weighted average period over which unrecognized share-based compensation costs are expected to be reported.

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Description of the estimated period of time over which an employee is required to provide service in exchange for the share-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant dates pertaining to a share-based award plan other than a stock option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

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The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance-sheet date.

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The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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The quantity of shares issuable on stock options awarded under the plan during the reporting period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(b)

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ Details

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(a)

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- Definition

As of the balance sheet date, the number of shares for which fully vested and expected to vest stock options can be exercised under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph d(2)

+ Details

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- Definition

As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph d(2)

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- Definition

Description of pertinent provisions of share based compensation awards that have actual or potential impact upon the company's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a

+ Details

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