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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, 2016
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period $ (12,152) $ (5,522)  
Net unrealized (losses) gains on cash flow hedges, net of tax, end of period 12,514 (12,152) $ (5,522)
Foreign Exchange Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net unrealized (losses) gains on cash flow hedges, net of tax, beginning of period (12,152) (5,522) 4,696
Changes in fair value of cash flow hedges, net of tax 20,911 (23,432) 9,162
Reclassification of losses (gains) into earnings, net of tax 3,755 16,802 (19,380)
Net unrealized (losses) gains on cash flow hedges, net of tax, end of period $ 12,514 $ (12,152) $ (5,522)