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STOCK-BASED COMPENSATION: Stock options outstanding and exercisable (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Stock options outstanding and exercisable by exercise price range |  |
Options outstanding (in shares) | 1,455,348 |
Options outstanding - Weighted-average remaining contractual life | 4 years 3 months 18 days |
Options outstanding - Weighted-average exercise price per share (in dollars per share) | $ 13.97 |
Options exercisable (in shares) | 1,301,861 |
Options exercisable - Weighted-average exercise price per share (in dollars per share) | $ 15.41 |
Range of exercise price per share from $0.61 to $9.99 |  |
Stock options outstanding and exercisable by exercise price range |  |
Exercise price per share, low end of range (in dollars per share) | 0.61 |
Exercise price per share, high end of range (in dollars per share) | $ 9.99 |
Options outstanding (in shares) | 304,410 |
Options outstanding - Weighted-average remaining contractual life | 6 years 2 months 12 days |
Options outstanding - Weighted-average exercise price per share (in dollars per share) | $ 1.61 |
Options exercisable (in shares) | 150,923 |
Options exercisable - Weighted-average exercise price per share (in dollars per share) | $ 1.51 |
Range of exercise price per share from $10.00 to $19.99 |  |
Stock options outstanding and exercisable by exercise price range |  |
Exercise price per share, low end of range (in dollars per share) | 10.00 |
Exercise price per share, high end of range (in dollars per share) | $ 19.99 |
Options outstanding (in shares) | 709,672 |
Options outstanding - Weighted-average remaining contractual life | 3 years 1 month 6 days |
Options outstanding - Weighted-average exercise price per share (in dollars per share) | $ 14.69 |
Options exercisable (in shares) | 709,672 |
Options exercisable - Weighted-average exercise price per share (in dollars per share) | $ 14.69 |
Range of exercise price per share from $20.00 to $24.99 |  |
Stock options outstanding and exercisable by exercise price range |  |
Exercise price per share, low end of range (in dollars per share) | 20.00 |
Exercise price per share, high end of range (in dollars per share) | $ 24.99 |
Options outstanding (in shares) | 441,266 |
Options outstanding - Weighted-average remaining contractual life | 4 years 10 months 24 days |
Options outstanding - Weighted-average exercise price per share (in dollars per share) | $ 21.32 |
Options exercisable (in shares) | 441,266 |
Options exercisable - Weighted-average exercise price per share (in dollars per share) | $ 21.32 |
Stock options |  |
Stock options outstanding and exercisable by exercise price range |  |
Share-based compensation expense | $ 1.8 | $ 1.7
Share-based compensation not yet recognized | $ 5.8 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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