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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Prior to Tax Cuts and Jobs Act [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Effective income tax rate | 36.20% | 32.20% | 33.50% | 32.60%
U.S. federal statutory income tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Subsequent to Tax Cuts and Jobs Act [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Long term liabilities for one time transition tax | $ 21,000 |  | $ 21,000 |
Reduction of U.S. tax liability on undistributed foreign earnings to estimate of one time transition tax | $ (14,528) |  | $ (14,528) |
Effective income tax rate | 19.30% |  | 23.70% |
U.S. federal statutory income tax rate | 21.00% |  | 21.00% |
Subsequent to Tax Cuts and Jobs Act [Member] | Net Income [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Adjustment of deferred tax assets and liabilities, amounts | $ (5,426) |  | $ (5,426) |
Subsequent to Tax Cuts and Jobs Act [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Adjustment of deferred tax assets and liabilities, amounts | $ 9,800 |  | $ 9,800 |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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