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Stockholders' Equity - Restricted Stock Units (Details) | 1 Months Ended | 12 Months Ended
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Mar. 31, 2017 USD ($) item $ / shares shares | Mar. 31, 2016 USD ($) item $ / shares shares | Apr. 04, 2015 USD ($) item $ / shares shares | Feb. 03, 2018 USD ($) item shares | Jan. 28, 2017 USD ($) item | Jan. 30, 2016 USD ($) item
Stockholders' Equity |  |  |  |  |  |
Target price for vesting of shares, four (in dollars per share) | $ 26.90 |  |  |  |  |
(Decrease) increase in excess tax benefits (in dollars) | $ |  |  |  | $ 70,000 | $ 200,000 | $ 1,300,000
Restricted Stock |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Compensation expense (in dollars) | $ |  |  |  | $ 1,600,000 | $ 2,900,000 | $ 4,100,000
Granted (in shares) | shares |  |  |  | 118,676 |  |
Restricted Stock | Director |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
March 2017 RSU |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Compensation expense (in dollars) | $ | $ 306,000 |  |  |  |  |
Number of employees to whom awards are granted | item | 2 |  |  |  |  |
Percentage of vesting upon achieving closing stock price for a 20 consecutive day period | 25.00% |  |  |  |  |
Consecutive period for which closing stock price should be achieved to vest shares | 20 days |  |  |  |  |
Target price for vesting of shares, one (in dollars per share) | $ 19.10 |  |  |  |  |
Target price for vesting of shares, two (in dollars per share) | 21.70 |  |  |  |  |
Target price for vesting of shares, three (in dollars per share) | $ 24.30 |  |  |  |  |
Number of employees to whom awards are granted who subsequently resigned | item | 1 |  |  |  |  |
Number of thresholds achieved | item |  |  |  | 3 |  |
Granted (in shares) | shares | 23,551 |  |  |  |  |
March 2016 RSU |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
Compensation expense (in dollars) | $ |  | $ 238,000 |  |  |  |
Number of employees to whom awards are granted | item |  | 2 |  |  |  |
Percentage of vesting upon achieving closing stock price for a 20 consecutive day period |  | 25.00% |  |  |  |
Consecutive period for which closing stock price should be achieved to vest shares |  | 20 days |  |  |  |
Target price for vesting of shares, one (in dollars per share) |  | $ 20.75 |  |  |  |
Target price for vesting of shares, two (in dollars per share) |  | 23.50 |  |  |  |
Target price for vesting of shares, three (in dollars per share) |  | 26.25 |  |  |  |
Target price for vesting of shares, four (in dollars per share) |  | $ 29.00 |  |  |  |
Number of thresholds achieved | item |  |  |  | 3 |  |
Granted (in shares) | shares |  | 24,816 |  |  |  |
March 2015 RSU |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Compensation expense (in dollars) | $ |  |  | $ 331,000 |  |  |
Number of employees to whom awards are granted | item |  |  | 2 |  |  |
Percentage of vesting upon achieving closing stock price for a 20 consecutive day period |  |  | 25.00% |  |  |
Consecutive period for which closing stock price should be achieved to vest shares |  |  | 20 days |  |  |
Target price for vesting of shares, one (in dollars per share) |  |  | $ 27.00 |  |  |
Target price for vesting of shares, two (in dollars per share) |  |  | 29.25 |  |  |
Target price for vesting of shares, three (in dollars per share) |  |  | 31.50 |  |  |
Target price for vesting of shares, four (in dollars per share) |  |  | $ 33.50 |  |  |
Number of thresholds achieved | item |  |  |  | 0 | 0 | 0
Granted (in shares) | shares |  |  | 16,823 |  |  |

X
- Definition Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified equity-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) reduces (increases) net cash provided by financing activities + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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