|
Cash, Cash Equivalents and Investments (Investments with Continuous Unrealized Losses and Their Related Fair Values) (Details) (USD $)
In Thousands, unless otherwise specified
|
May 31, 2014
|
Nov. 30, 2013
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value, Less Than 12 Months |
$ 0 |
$ 0 |
| Unrealized Losses, Less Than 12 Months |
0 |
0 |
| Fair Value, 12 Months or Greater |
25,056 |
24,761 |
| Unrealized Losses, 12 Months or Greater |
(3,694) |
(3,989) |
| Total, Fair Value |
25,056 |
24,761 |
| Total, Unrealized Losses |
(3,694) |
(3,989) |
|
Auction rate securities - municipal bonds [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value, Less Than 12 Months |
0 |
0 |
| Unrealized Losses, Less Than 12 Months |
0 |
0 |
| Fair Value, 12 Months or Greater |
22,187 |
21,933 |
| Unrealized Losses, 12 Months or Greater |
(3,063) |
(3,317) |
| Total, Fair Value |
22,187 |
21,933 |
| Total, Unrealized Losses |
(3,063) |
(3,317) |
|
Auction rate securities - student loans [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fair Value, Less Than 12 Months |
0 |
0 |
| Unrealized Losses, Less Than 12 Months |
0 |
0 |
| Fair Value, 12 Months or Greater |
2,869 |
2,828 |
| Unrealized Losses, 12 Months or Greater |
(631) |
(672) |
| Total, Fair Value |
2,869 |
2,828 |
| Total, Unrealized Losses |
$ (631) |
$ (672) |