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v2.4.1.9

Schedule of Change in Retained Earnings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
Retained Earnings Adjustments [Line Items] |  |  |  |
Beginning Balance |  |  | $ 1,030,428 us-gaap_RetainedEarningsAccumulatedDeficit |
Net income | 28,648 us-gaap_NetIncomeLoss | 16,192 us-gaap_NetIncomeLoss | 67,573 us-gaap_NetIncomeLoss | 57,300 us-gaap_NetIncomeLoss
Dividends declared and paid |  |  | (28,824)us-gaap_DividendsCommonStockCash |
Ending Balance | $ 1,069,177 us-gaap_RetainedEarningsAccumulatedDeficit |  | $ 1,069,177 us-gaap_RetainedEarningsAccumulatedDeficit |

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