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Stock-Based Compensation - Summary of Changes in Unvested Options (Detail) (USD $) | 3 Months Ended
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Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted-average exercise price per share, Beginning balance | $ 19.70
Weighted-average exercise price per share, Granted |
Weighted-average exercise price per share, Ending balance | $ 19.85
Unvested stock options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Beginning balance | 51,466
Number of options, Granted |
Number of options, Vested | (11,896)
Number of options, Cancelled | (473)
Number of options, Ending balance | 39,097
Weighted-average exercise price per share, Beginning balance | $ 10.61
Weighted-average exercise price per share, Granted |
Weighted-average exercise price per share, Vested | $ 11.40
Weighted-average exercise price per share, Cancelled | $ 10.76
Weighted-average exercise price per share, Ending balance | $ 10.37
Weighted-average grant date fair value per option, Beginning balance | $ 8.45
Weighted-average grant date fair value per option, Granted |
Weighted-average grant date fair value per option, Vested | $ 9.14
Weighted-average grant date fair value per option, Cancelled | $ 7.82
Weighted-average grant date fair value per option, Ending balance | $ 8.25

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- Definition Share based compensation arrangement by share based payment award options cancelled in period weighted average grant date fair value. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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