Stockholders' Equity (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Sep. 30, 2013
Weighted Average Remaining Contractual Life and Weighted Average Per Share Exercise Price of Options Outstanding and Options Exercisable
Weighted average remaining contractual term for options outstanding	2 years 10 months 12 days
$ 1.68 - $ 7.60 [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)	$ 7.60
Number of Shares, Options Outstanding	570
Weighted average remaining contractual term for options outstanding	3 years 6 months 13 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 6.69
Number of Shares, Options Exercisable	472
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 6.58
$ 7.61 - $ 7.67 [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)	$ 7.61
Range of Exercise Price, maximum (USD per share)	$ 7.67
Number of Shares, Options Outstanding	650
Weighted average remaining contractual term for options outstanding	2 years 10 months 4 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 7.67
Number of Shares, Options Exercisable	650
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 7.67
$ 7.68 - $ 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)	$ 7.68
Range of Exercise Price, maximum (USD per share)	$ 11.86
Number of Shares, Options Outstanding	469
Weighted average remaining contractual term for options outstanding	3 years 7 months 6 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 10.45
Number of Shares, Options Exercisable	431
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 10.34
$ 11.87 - $ 14.20 [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)	$ 14.20
Number of Shares, Options Outstanding	599
Weighted average remaining contractual term for options outstanding	2 years 7 months 17 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 12.78
Number of Shares, Options Exercisable	577
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 12.81
$ 14.21 - $ 23.32 [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)	$ 14.21
Range of Exercise Price, maximum (USD per share)	$ 23.32
Number of Shares, Options Outstanding	382
Weighted average remaining contractual term for options outstanding	1 year 7 months 9 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 17.26
Number of Shares, Options Exercisable	382
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 17.26
$ 1.68 - $ 23.32 [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)	$ 23.32
Number of Shares, Options Outstanding	2,670
Weighted average remaining contractual term for options outstanding	2 years 10 months 24 days
Weighted Average Exercise Price, Options Outstanding (USD per share)	$ 10.47
Number of Shares, Options Exercisable	2,512
Weighted Average Exercise Price, Options Exercisable (USD per share)	$ 10.56

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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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