Share Based Compensation Arrangement By Share Based Payment Award Exercise Price Under Fair Value Percentage

No definition available.

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- Definition

Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

+ References

No definition available.

+ Details

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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- Definition

Percentage of vesting of share-based compensation awards.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ 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)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ 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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Stock-based compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost	$ 756,090	$ 787,874	$ 559,157
Stock Option Plan 2002
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period	10 years
Shares reserved for future issuance	280,000
Share-based payment award vesting percentage On each anniversary	25.00%
Fair Value Of options granted	78,645
Weighted average grant date fair value of options granted		$ 14.98
Intrinsic value of options exercised		912,558
Proceed from exercise of options		243,234
Unrecognized option costs	55,208
Weighted average period of recognition for unrecognized option costs	2 years 3 months 18 days
Stock Option Plan 2002 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, exercise price as percentage of fair market value	110.00%
Stock Option Plan 2002 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, exercise price as percentage of fair market value	50.00%
Stock Option Plan 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period	10 years
Shares reserved for future issuance	358,000
Share-based payment award vesting percentage On each anniversary	25.00%
Fair Value Of options granted	108,481	705,890	146,602
Intrinsic value of options exercised		1,230,857
Proceed from exercise of options		912,310
Unrecognized option costs	14,131
Weighted average period of recognition for unrecognized option costs	3 months 18 days
Stock Option Plan 2004 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, exercise price as percentage of fair market value	110.00%
Stock Option Plan 2004 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, exercise price as percentage of fair market value	50.00%
Stock Option Plan 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period	10 years
Shares reserved for future issuance	670,000
Fair Value Of options granted	1,542,072	873,798	740,930
Weighted average grant date fair value of options granted		$ 12.86	$ 15.37
Intrinsic value of options exercised		670,998
Proceed from exercise of options		209,133
Unrecognized option costs	$ 903,962
Weighted average period of recognition for unrecognized option costs	2 years
Stock Option Plan 2006 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting percentage On each anniversary	25.00%
Options, exercise price as percentage of fair market value	110.00%
Stock Option Plan 2006 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment award vesting percentage On each anniversary	20.00%
Options, exercise price as percentage of fair market value	50.00%