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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Sep. 30, 2015
Employee Benefits and Share-based Compensation [Abstract] |
Schedule of components of net periodic pension cost | The following table provides a detail of the components of net periodic pension cost (in thousands):
|  |  | Three Months Ended September 30, |  | Six Months Ended September 30, |
|  |  | 2015 |  | 2014 |  | 2015 |  | 2014 |
| Service cost for benefits earned during the period |  | $ | 2,399 |  |  | $ | 2,087 |  |  | $ | 4,772 |  |  | $ | 4,333 |  |
| Interest cost on pension benefit obligation |  | 5,226 |  |  | 6,437 |  |  | 10,396 |  |  | 13,366 |  |
| Expected return on assets |  | (7,014 | ) |  | (7,638 | ) |  | (13,955 | ) |  | (15,861 | ) |
| Amortization of unrecognized losses |  | 2,153 |  |  | 1,641 |  |  | 4,285 |  |  | 3,409 |  |
| Net periodic pension cost |  | $ | 2,764 |  |  | $ | 2,527 |  |  | $ | 5,498 |  |  | $ | 5,247 |  |
Schedule of Black Scholes Assumptions | The following table shows the assumptions used to compute the stock-based compensation expense for stock options granted during the six months ended September 30, 2015:
| Risk free interest rate | 1.62 | % |
| Expected life (years) | 6 |  |
| Volatility | 28.1 | % |
| Dividend yield | 3.14 | % |
| Weighted average exercise price of options granted | $57.52 per option |  |
| Weighted average grant-date fair value of options granted | $10.71 per option |  |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- 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
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