|
Fair Values (Narrative) (Details) (USD $)
|
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jan. 31, 2015
|
Jan. 31, 2014
|
Jan. 31, 2015
|
Jan. 31, 2014
|
Jul. 31, 2014
|
|
| Debt Instrument [Line Items] | |||||
| Aggregate carrying amount of equity method investments | $ 20,100,000 | $ 20,100,000 | $ 21,400,000 | ||
| Impairment charges | 0 | 0 | 0 | 0 | |
| Long-Term Debt [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Fair value of debt | 245,200,000 | 245,200,000 | |||
| Debt carrying amount | $ 225,000,000 | $ 225,000,000 | |||