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Stock-Based Compensation Expense (Details) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2012
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Jul. 28, 2010
Restricted Stock and Stock Option Plan [Member]
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Jul. 28, 2010
2011 Long-term Incentive Plan [Member]
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May 05, 2011
IPO [Member]
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Mar. 31, 2014
Stock Options [Member]
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Mar. 31, 2013
Stock Options [Member]
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Mar. 31, 2012
Stock Options [Member]
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Mar. 31, 2014
Stock Options [Member]
Maximum [Member]
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May 05, 2011
Stock Options [Member]
IPO [Member]
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Mar. 31, 2014
Restricted Stock [Member]
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Mar. 31, 2013
Restricted Stock [Member]
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Mar. 31, 2012
Restricted Stock [Member]
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Dec. 31, 2012
Performance Shares [Member]
Executive_Officers
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Mar. 31, 2014
Performance Shares [Member]
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Mar. 31, 2013
Performance Shares [Member]
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Mar. 31, 2014
Performance Shares [Member]
Minimum [Member]
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Mar. 31, 2013
Performance Shares [Member]
Minimum [Member]
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Mar. 31, 2014
Performance Shares [Member]
Maximum [Member]
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Mar. 31, 2013
Performance Shares [Member]
Maximum [Member]
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Mar. 31, 2014
Common Stock [Member]
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Mar. 31, 2013
Common Stock [Member]
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Mar. 31, 2012
Common Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||||||
| Intrinsic value of stock options exercised | $ 10,285,000 | $ 18,387,000 | $ 8,860,000 | |||||||||||||||||||||
| Adjustments to APIC, income tax deficiency from share-based compensation | 1,452,000 | |||||||||||||||||||||||
| Excess tax deduction from stock options exercises | 4,131,000 | 2,181,000 | 4,131,000 | 2,181,000 | ||||||||||||||||||||
| Maximum number of shares of the company's common stock that may be awarded | 2,767,171 | 2,893,341 | ||||||||||||||||||||||
| Options, vested and exercisable (in shares) | 2,757,524 | |||||||||||||||||||||||
| Stock compensation expense associated with the acceleration of the pre-IPO options | 6,310,000 | |||||||||||||||||||||||
| Vesting period (in years) | 5 years | |||||||||||||||||||||||
| Annual vesting percentage | 20.00% | |||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | ||||||||||||||||||||||||
| Options outstanding, beginning of period (in shares) | 1,132,780.00 | 2,179,625 | 2,757,524 | |||||||||||||||||||||
| Granted (in shares) | 56,532 | 117,600 | ||||||||||||||||||||||
| Exercised (in shares) | (566,487) | (1,086,486) | (683,443) | (21,000) | (8,000) | 0 | (566,487,000) | (1,086,486,000) | (683,443,000) | |||||||||||||||
| Forfeited (in shares) | (7,827) | (16,891) | (12,056) | 0 | 0 | 0 | (1,660) | |||||||||||||||||
| Options outstanding, end of period (in shares) | 558,466.000 | 1,132,780.00 | 2,179,625 | |||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] | ||||||||||||||||||||||||
| Options outstanding, weighted average exercise price, beginning of period (in dollars per share) | $ 6.98 | $ 5.74 | $ 5.38 | |||||||||||||||||||||
| Granted, weighted average exercise price (in dollars per share) | $ 21.52 | $ 12.00 | $ 20.09 | $ 21.52 | $ 12.42 | |||||||||||||||||||
| Exercised, weighted average exercise price (in dollars per share) | $ 5.90 | $ 5.31 | $ 5.38 | $ 18.09 | $ 12.42 | $ 0.00 | ||||||||||||||||||
| Forfeited, weighted average exercise price (in dollars per share) | $ 15.73 | $ 7.98 | $ 6.46 | $ 0.00 | $ 0.00 | $ 0.00 | ||||||||||||||||||
| Options outstanding, weighted average exercise price, end of period (in dollars per share) | $ 7.96 | $ 6.98 | $ 5.74 | |||||||||||||||||||||
| Stock compensation expense | 2,203,000 | 1,341,000 | 6,514,000 | |||||||||||||||||||||
| Closing price (in dollars per share) | $ 23.18 | |||||||||||||||||||||||
| Aggregate intrinsic value | 406,000 | |||||||||||||||||||||||
| Total unrecognized expense related to non-vested stock option awards | 704,000 | 130,000 | 384,000 | |||||||||||||||||||||
| Stock based compensation, recognition period | 2 years 6 months 29 days | 0 years 4 months 6 days | ||||||||||||||||||||||
| Number of executives issued stock | 4 | |||||||||||||||||||||||
| Total fair value of options issued | $ 480,000 | $ 960,000 | ||||||||||||||||||||||
| Expiration term | 10 years | |||||||||||||||||||||||
| Amortization Period For The Fair Value Share Based Compsensation Award (in years) | 3 years | |||||||||||||||||||||||
| Possible number of shares issued each year | 0 | 0 | 29,036 | 29,430 | ||||||||||||||||||||