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Derivatives (Table Text Block) | 6 Months Ended
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Sep. 30, 2017
Derivative Instrument Detail [Abstract] |
Derivatives |
| Original variable rate debt amount |  | Agreement Date |  | Effective Date |  | Expiration Date |  | Designated cash flow hedge date
| (Unaudited) |  |  |  |  |  |  |  |  |
| (In millions) |  |  |  |  |  |  |  |  |
$ | 300.0 |  |  | 8/16/2006 |  | 8/18/2006 |  | 8/10/2018 |  | 8/4/2006
| 25.0 | (a) |  | 4/26/2011 |  | 6/1/2011 |  | 6/1/2018 |  | 6/1/2011
| 50.0 | (a) |  | 7/29/2011 |  | 8/15/2011 |  | 8/15/2018 |  | 7/29/2011
| 20.0 | (a) |  | 8/3/2011 |  | 9/12/2011 |  | 9/10/2018 |  | 8/3/2011
| 15.1 | (b) |  | 3/27/2012 |  | 3/28/2012 |  | 3/28/2019 |  | 3/26/2012
| 25.0 |  |  | 4/13/2012 |  | 4/16/2012 |  | 4/1/2019 |  | 4/12/2012
| 44.3 |  |  | 1/11/2013 |  | 1/15/2013 |  | 12/15/2019 |  | 1/11/2013
| (a) forward swap |  |  |  |  |  |  |  |  |
| (b) operating lease |  |  |  |  |  |  |  |  |
Derivative Fair Values Located in Accounts Payable and Accrued Expenses in the Balance Sheet |
|  | Liability Derivatives Fair Values as of
|  | September 30, 2017 |  | March 31, 2017
|  | (Unaudited) |  |
|  | (In thousands)
Interest rate contracts designated as hedging instruments | $ | 2,167 | $ | 4,903
Effect of Interest Rate Contracts on the Statement of Operations |
|  | The Effect of Interest Rate Contracts on the Statements of Operations for the Six Months Ended
|  | September 30, 2017 |  | September 30, 2016
|  | (Unaudited)
|  | (In thousands)
Loss recognized in income on interest rate contracts | $ | 2,624 | $ | 5,102
Gain recognized in AOCI on interest rate contracts (effective portion) | $ | (2,744) | $ | (5,186)
Loss reclassified from AOCI into income (effective portion) | $ | 2,618 | $ | 5,107
(Gain) loss recognized in income on interest rate contracts (ineffective portion and amount excluded from effectiveness testing) | $ | 6 | $ | (5)

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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