Fair Value Measurements (Schedule Of Items Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
|
May. 31, 2015 |
Feb. 28, 2015 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Money market securities |
$ 733,700
|
$ 380,100
|
| Mutual fund investments |
13,467
|
9,242
|
| Derivative instruments |
66
|
1,201
|
| Total assets at fair value |
$ 747,233
|
$ 390,543
|
| Percent of total assets at fair value |
100.00%
|
100.00%
|
| Percent of total assets |
5.50%
|
3.00%
|
| Liability derivatives |
$ (2,633)
|
$ (1,064)
|
| Total liabilities at fair value |
$ (2,633)
|
$ (1,064)
|
| Percent of total liabilities |
0.00%
|
0.00%
|
| Fair Value, Equity, Level 1 to Level 2 Transfers, Description |
no
|
|
| Level 1 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Money market securities |
$ 733,700
|
$ 380,100
|
| Mutual fund investments |
13,467
|
9,242
|
| Derivative instruments |
0
|
0
|
| Total assets at fair value |
$ 747,167
|
$ 389,342
|
| Percent of total assets at fair value |
100.00%
|
99.70%
|
| Percent of total assets |
5.50%
|
2.90%
|
| Liability derivatives |
$ 0
|
$ 0
|
| Total liabilities at fair value |
$ 0
|
$ 0
|
| Percent of total liabilities |
0.00%
|
0.00%
|
| Level 2 [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Money market securities |
$ 0
|
$ 0
|
| Mutual fund investments |
0
|
0
|
| Derivative instruments |
66
|
1,201
|
| Total assets at fair value |
$ 66
|
$ 1,201
|
| Percent of total assets at fair value |
0.00%
|
0.30%
|
| Percent of total assets |
0.00%
|
0.00%
|
| Liability derivatives |
$ (2,633)
|
$ (1,064)
|
| Total liabilities at fair value |
$ (2,633)
|
$ (1,064)
|
| Percent of total liabilities |
0.00%
|
0.00%
|