XML 69 R19.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stock-based Compensation (Tables) | 3 Months Ended
--- | ---
Jun. 30, 2013
Stock-based Compensation |
Schedule of amounts recognized in the condensed financial statements related to stock-based compensation | Amounts recognized in the condensed financial statements related to stock-based compensation are as follows (in thousands, except per share data):
|  | Three months ended June 30, |
|  | 2013 |  | 2012 |
Total cost of stock-based compensation charged against income before income taxes |  | $ | 149 |  | $ | 149 |
Amount of income tax benefit recognized in earnings |  | 57 |  | 51 |
Amount charged against net income |  | $ | 92 |  | $ | 98 |
Impact on net income per common share: |  |  |  |  |
Basic |  | $ | 0.03 |  | $ | 0.03 |
Diluted |  | 0.03 |  | 0.03 |
Schedule of Black-Scholes assumptions used for option grants |
|  | Three months ended June 30, |
|  | 2013 |  | 2012 |
Volatility |  | 28.7% |  | 31.1% |
Risk-free interest rate |  | 0.8 – 1.2% |  | 0.6 – 1.0% |
Expected stock option life (years) |  | 5 – 10 |  | 5 – 10 |
Dividend yield |  | 1.1% |  | 1.5% |
Summary of stock option activity |
|  | Number of Shares |  | Weighted- average Exercise Price per Share |  | Weighted- average Remaining Contractual Term |  | Aggregate Intrinsic Value (000s) |
Outstanding at March 31, 2013 |  | 416,125 |  | $ | 29.87 |  | 3.7 |  | $ | 9,529 |
Stock options granted |  | 101,124 |  | 51.85 |  | 6.2 |  |  |
Stock options forfeited |  | (6,569 | ) | 42.84 |  |  |  |  |
Stock options expired |  | — |  | — |  |  |  |  |
Stock options exercised |  | (11,320 | ) | 22.43 |  |  |  |  |
Outstanding at June 30, 2013 |  | 499,360 |  | 34.31 |  | 4.3 |  | 9,893 |
Exercisable at June 30, 2013 |  | 237,215 |  | 24.26 |  | 3.2 |  | 7,086 |
Summary of the status of unvested option shares |
|  | Number of Shares |  | Weighted- average Grant-Date Fair Value |
Unvested at March 31, 2013 |  | 257,805 |  | $ | 9.55 |
Stock options granted |  | 101,124 |  | 11.93 |
Stock options forfeited |  | (6,199 | ) | 9.91 |
Stock options vested |  | (90,585 | ) | 6.92 |
Unvested at June 30, 2013 |  | 262,145 |  | 11.44 |

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for unvested share options (or share units) that were outstanding at the beginning and end of the year, and the number of unvested share options or share units that were granted, vested, forfeited, and expired during the year. + References No definition available. + Details
Name: | mlab_ScheduleOfShareBasedCompensationUnvestedStockOptionsActivityTableTextBlock
Namespace Prefix: | mlab_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: 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=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph 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. Reference 3: 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=6793087&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration