Stockholders' Equity - Options Outstanding (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2013
$ 1.68 - $ 7.12 [Member]
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Range of Exercise Price, minimum (USD per share)	$ 1.68
Range of Exercise Price, maximum (USD per share)	$ 7.12
Options Outstanding	797
Weighted Average Remaining Contractual Life	2 years 7 months 28 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 6.61
Options Exercisable	483
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 6.29
$ 7.13 - $ 8.07 [Member]
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Range of Exercise Price, minimum (USD per share)	$ 7.13
Range of Exercise Price, maximum (USD per share)	$ 8.07
Options Outstanding	853
Weighted Average Remaining Contractual Life	3 years 6 months 26 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 7.71
Options Exercisable	831
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 7.70
$ 8.08 - $ 11.86 [Member]
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Range of Exercise Price, minimum (USD per share)	$ 8.08
Range of Exercise Price, maximum (USD per share)	$ 11.86
Options Outstanding	706
Weighted Average Remaining Contractual Life	4 years 2 months 5 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 10.44
Options Exercisable	607
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 10.27
$ 11.87 - $ 14.40 [Member]
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Range of Exercise Price, minimum (USD per share)	$ 11.87
Range of Exercise Price, maximum (USD per share)	$ 14.40
Options Outstanding	766
Weighted Average Remaining Contractual Life	2 years 10 months 10 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 12.90
Options Exercisable	703
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 12.96
$ 14.41 - $ 24.16 [Member]
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Range of Exercise Price, minimum (USD per share)	$ 14.41
Range of Exercise Price, maximum (USD per share)	$ 24.16
Options Outstanding	370
Weighted Average Remaining Contractual Life	1 year 11 months 12 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 18.16
Options Exercisable	370
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 18.16
$ 1.68 - $ 24.16 [Member]
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Range of Exercise Price, minimum (USD per share)	$ 1.68
Range of Exercise Price, maximum (USD per share)	$ 24.16
Options Outstanding	3,492
Weighted Average Remaining Contractual Life	3 years 1 month 28 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 10.26
Options Exercisable	2,994
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 10.52

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

+ Details

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

+ Details

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

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