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Derivative Financial Instruments - Changes in Net Unrealized (Losses) Gains on Cash Flow Hedges (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period $ (5,522) $ 4,696  
Net unrealized (losses) gains on cash flow hedges, net of tax, end of period (12,152) (5,522) $ 4,696
Foreign Exchange Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period (5,522) 4,696 (17,942)
Changes in fair value of cash flow hedges, net of tax (23,432) 9,162 20,035
Reclassification of losses (gains) into earnings, net of tax 16,802 (19,380) 2,603
Net unrealized (losses) gains on cash flow hedges, net of tax, end of period $ (12,152) $ (5,522) $ 4,696