Activity Related to Change in Net Unrealized Gains (Losses) on Cash Flow Hedges, Net of Tax, in Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands | 12 Months Ended | |
|---|---|---|
Aug. 31, 2011 | Aug. 31, 2010 | |
| Derivative [Line Items] | ||
| Net unrealized gains (losses) on cash flow hedges, net of tax, beginning of period | $ 4,340 | $ (10,575) |
| Change in fair value, net of tax of $27,837 and $15,276, respectively | 44,229 | 26,806 |
| Reclassification adjustments into Cost of services, net of tax of $(8,276) and $(3,865), respectively | (13,478) | (9,959) |
| Portion attributable to Noncontrolling interests, net of tax of $(1,741) and $(1,310), respectively | (2,737) | (1,932) |
| Net unrealized gains on cash flow hedges, net of tax, end of period | $ 32,354 | $ 4,340 |