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Employee Benefit Plans (Additional Information For Share Based Compensation) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Mar. 31, 2019 USD ($) installment $ / shares shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 shares
Employee Benefit Plan |  |  |  |
Share-based compensation expenses capitalized as inventory | $ | $ 0.9 | $ 0.7 | $ 0.6 |
Offering period of ESPP Plan | 6 months |  |  |
Percent of granted and vested of target number |  | 100.00% |  |
Tax benefit realized for the tax deduction from options exercised | $ | $ 0.2 | $ 1.8 | $ 4.2 |
1996 ESPP and 2006 ESPP |  |  |  |
Employee Benefit Plan |  |  |  |
Purchase price of shares expressed as percentage of the fair market value | 85.00% |  |  |
Number of shares reserved for issuance (in shares) | 29,000,000.0 |  |  |
Number of shares available for issuance (in shares) | 5,400,000 |  |  |
2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Number of shares reserved for issuance (in shares) | 30,600,000 |  |  |
Number of shares available for issuance (in shares) | 9,200,000 |  |  |
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 |  |  |  |
Employee Benefit Plan |  |  |  |
Exercise price, lower range limit (in dollars per share) | $ / shares | $ 2 |  |  |
Exercise price, upper range limit (in dollars per share) | $ / shares | $ 39 |  |  |
Stock Options | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Expiration period | 10 years |  |  |
Time-based RSUs | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Vesting installment | installment | 4 |  |  |
Performance-based RSUs | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Vesting period |  |  | 3 years | 3 years
Market Based RSUs | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Vesting period | 3 years |  |  |
Market-based and performance-based RSUs |  |  |  |
Employee Benefit Plan |  |  |  |
RSUs outstanding (in shares) | 1,100,000 |  |  |
Market-based and performance-based RSUs | 2006 Plan |  |  |  |
Employee Benefit Plan |  |  |  |
Vesting period | 3 years | 3 years |  |
TSR Period | 3 years | 3 years |  |
Performance period | 3 years | 3 years | 3 years | 3 years
Restricted Stock Units (RSUs) |  |  |  |
Employee Benefit Plan |  |  |  |
RSUs outstanding (in shares) | 4,421,000 | 5,221,000 | 6,181,000 | 5,521,000
Tax benefit realized for the tax deduction from RSUs vested during period | $ | $ 16.2 | $ 20.3 | $ 13.1 |
Minimum | Market Based RSUs |  |  |  |
Employee Benefit Plan |  |  |  |
Percent of TSR |  |  | 0.00% | 0.00%
Maximum | Market Based RSUs |  |  |  |
Employee Benefit Plan |  |  |  |
Percent of TSR |  |  | 150.00% | 150.00%

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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=109197908&loc=d3e5070-113901 + Details
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