Fair Value Measures (Tables)

12 Months Ended

Aug. 31, 2011

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets And Liabilities Measured At Fair Value

	Fair Value Measurements at Reporting Date Using
August 31, 2011	Level 1		Level 2		Level 3		Total
Assets
Corporate money market funds	$	161,168	$	0	$	0	$	161,168
Derivative instruments		0		897		0		897
Total assets measured at fair value	$	161,168	$	897	$	0	$	162,065
Liabilities
Derivative instruments	$	0	$	0	$	0	$	0
Total liabilities measured at fair value	$	0	$	0	$	0	$	0

	Fair Value Measurements at Reporting Date Using
August 31, 2010	Level 1		Level 2		Level 3		Total
Assets
Corporate money market funds	$	172,218	$	0	$	0	$	172,218
Derivative instruments		0		879		0		879
Total assets measured at fair value	$	172,218	$	879	$	0	$	173,097
Liabilities
Derivative instruments	$	0	$	1,220	$	0	$	1,220
Total liabilities measured at fair value	$	0	$	1,220	$	0	$	1,220

Carrying (Reported) Amount, Fair Value Disclosure [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets And Liabilities Measured At Fair Value

	Fair Value Measurements at Reporting Date Using
August 31, 2011	Level 1		Level 2		Level 3		Total
Cash equivalents	$	161,168	$	0	$	0	$	161,168
Other current assets (derivative assets)				897				897
Total assets measured at fair value	$	161,168	$	897	$	0	$	162,065
Accounts payable and accrued liabilities (derivative liabilities)	$	0	$	0	$	0	$	0
Deferred rent and other non-current liabilities (derivative liabilities)		0		0		0		0
Total liabilities measured at fair value	$	0	$	0	$	0	$	0

	Fair Value Measurements at Reporting Date Using
August 31, 2010	Level 1		Level 2		Level 3		Total
Cash equivalents	$	172,218	$	0	$	0	$	172,218
Other current assets (derivative assets)		0		879		0		879
Total assets measured at fair value	$	172,218	$	879	$	0	$	173,097
Accounts payable and accrued liabilities (derivative liabilities)	$	0	$	1,027	$	0	$	1,027
Deferred rent and other non-current liabilities (derivative liabilities)		0		193		0		193
Total liabilities measured at fair value	$	0	$	1,220	$	0	$	1,220