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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Nov. 30, 2013
|
May 31, 2014
|
|
| Cash, Cash Equivalents and Investments [Line Items] | ||
| Amortized Cost Basis | $ 260,406 | $ 255,191 |
| Realized Losses | (380) | |
| Unrealized Gains | 164 | 135 |
| Unrealized Losses | (3,989) | (3,694) |
| Fair Value | 256,201 | 251,632 |
|
State and municipal bond obligations [Member]
|
||
| Cash, Cash Equivalents and Investments [Line Items] | ||
| Amortized Cost Basis | 30,938 | 24,470 |
| Realized Losses | 0 | |
| Unrealized Gains | 164 | 135 |
| Unrealized Losses | 0 | 0 |
| Fair Value | 31,102 | 24,605 |
|
Auction rate securities - municipal bonds [Member]
|
||
| Cash, Cash Equivalents and Investments [Line Items] | ||
| Amortized Cost Basis | 27,150 | 25,250 |
| Realized Losses | (380) | |
| Unrealized Gains | 0 | 0 |
| Unrealized Losses | (3,317) | (3,063) |
| Fair Value | 23,453 | 22,187 |
|
Auction rate securities - student loans [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||
| Amortized Cost Basis | 3,500 | 3,500 |
| Realized Losses | 0 | |
| Unrealized Gains | 0 | 0 |
| Unrealized Losses | (672) | (631) |
| Fair Value | 2,828 | 2,869 |
|
Cash [Member]
|
||
| Cash, Cash Equivalents and Investments [Line Items] | ||
| Amortized Cost Basis | 144,305 | 127,279 |
| Fair Value | 144,305 | 127,279 |
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Money market funds [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||
| Amortized Cost Basis | 54,513 | 74,692 |
| Fair Value | $ 54,513 | $ 74,692 |