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Employee Benefit Plans (Additional Information For Share Based Compensation) (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) installment $ / shares shares | Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 shares
Employee Benefit Plan |  |  |  |
Share-based compensation expenses capitalized as inventory | $ | $ 1.1 | $ 0.9 | $ 0.9 |
Percent of granted and vested of target number | 100.00% |  |  |
Exercise price, lower range limit (in dollars per share) | $ / shares | $ 8 |  |  |
Exercise price, upper range limit (in dollars per share) | $ / shares | $ 41 |  |  |
Tax benefit realized for the tax deduction from options exercised | $ | $ 0.6 | $ 0.1 | $ 0.2 |
1996 ESPP and 2006 ESPP |  |  |  |
Employee Benefit Plan |  |  |  |
Purchase price of shares expressed as percentage of the fair market value | 85.00% |  |  |
Offering period of ESPP Plan | 6 months |  |  |
Number of shares reserved for issuance (in shares) | 29,000,000.0 |  |  |
Number of shares available for issuance (in shares) | 4,700,000 |  |  |
2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Number of shares reserved for issuance (in shares) | 30,600,000 |  |  |
Number of shares available for issuance (in shares) | 7,800,000 |  |  |
2012 Stock Inducement Equity Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Number of shares reserved for issuance (in shares) | 1,800,000 |  |  |
Number of shares available for issuance (in shares) | 0 |  |  |
Stock Options | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Expiration period | 10 years |  |  |
Time-based RSUs | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Vesting installment | installment | 4 |  |  |
Market-based and performance-based RSUs |  |  |  |
Employee Benefit Plan |  |  |  |
RSUs outstanding (in shares) | 900,000 |  |  |
Market-based and performance-based RSUs | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Performance period | 3 years |  |  |
TSR Period | 3 years |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Employee Benefit Plan |  |  |  |
RSUs outstanding (in shares) | 3,643,000 | 3,951,000 | 4,421,000 | 5,221,000
Tax benefit realized for the tax deduction from RSUs vested during period | $ | $ 16.3 | $ 12.1 | $ 16.2 |

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- Definition Disclosure of the aggregate tax benefit realized from vesting of RSUs (restricted stock units) during the annual period. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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