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Derivative Instruments (Table Text Block) | 6 Months Ended
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Sep. 30, 2012
Derivative Instrument Detail [Abstract] |
Schedule of derivative instruments | We manage exposure to changes in market interest rates. Our use of derivative instruments is limited to highly effective interest rate swaps to hedge the risk of changes in cash flows (future interest payments) attributable to changes in LIBOR swap rates, the designated benchmark interest rate being hedged on certain of our LIBOR indexed variable rate debt and a variable rate operating lease. The interest rate swaps effectively fix our interest payments on certain LIBOR indexed variable rate debt. We monitor our positions and the credit ratings of our counterparties and do not currently anticipate non-performance by the counterparties. Interest rate swap agreements are not entered into for trading purposes.
Original variable rate debt amount |  | Agreement Date |  | Effective Date |  | Expiration Date |  | Designated cash flow hedge date
(Unaudited)
(In millions)
$ | 50.0 |  |  |  | 6/21/2006 |  | 7/10/2006 |  | 7/10/2013 |  | 6/9/2006
| 144.9 |  | (a) |  | 6/9/2006 |  | 10/10/2006 |  | 10/10/2012 |  | 6/9/2006
| 300.0 |  |  |  | 8/16/2006 |  | 8/18/2006 |  | 8/10/2018 |  | 8/4/2006
| 30.0 |  |  |  | 2/9/2007 |  | 2/12/2007 |  | 2/10/2014 |  | 2/9/2007
| 20.0 |  |  |  | 3/8/2007 |  | 3/12/2007 |  | 3/10/2014 |  | 3/8/2007
| 20.0 |  |  |  | 3/8/2007 |  | 3/12/2007 |  | 3/10/2014 |  | 3/8/2007
| 19.3 |  | (a) |  | 4/8/2008 |  | 8/15/2008 |  | 6/15/2015 |  | 3/31/2008
| 19.0 |  |  |  | 8/27/2008 |  | 8/29/2008 |  | 7/10/2015 |  | 4/10/2008
| 30.0 |  |  |  | 9/24/2008 |  | 9/30/2008 |  | 9/10/2015 |  | 9/24/2008
| 15.0 |  | (a) |  | 3/24/2009 |  | 3/30/2009 |  | 3/30/2016 |  | 3/25/2009
| 14.7 |  | (a) |  | 7/6/2010 |  | 8/15/2010 |  | 7/15/2017 |  | 7/6/2010
| 25.0 |  | (a) |  | 4/26/2011 |  | 6/1/2011 |  | 6/1/2018 |  | 7/1/2011
| 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
(a) forward swap
(b) operating lease
As of September 30, 2012, the total notional amount of our variable interest rate swaps on debt and an operating lease was $442.0 million and $14.4 million, respectively.

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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 4 -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 Reference 2: 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=7476318&loc=d3e41678-113959 Reference 3: 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=7476318&loc=SL5580258-113959 Reference 4: 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=6881521&loc=d3e23780-122690 Reference 5: 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=7476318&loc=SL5579245-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 7: 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=7476318&loc=d3e41620-113959 Reference 8: 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=7476318&loc=SL5624163-113959 Reference 9: 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=7476318&loc=d3e41641-113959 Reference 10: 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=7476318&loc=SL5579240-113959 Reference 11: 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=7476318&loc=SL5624171-113959 + Details
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