Fair Value Measurement (Details) - USD ($)	6 Months Ended
	Feb. 29, 2016	Aug. 31, 2015
Assets recorded at fair value:
Foreign exchange forward contracts	$ 802,000	$ 1,818,000
Liabilities recorded at fair value:
Foreign exchange forward contracts	1,349,000	1,576,000
Liabilities not recorded at fair value:
Long-term fixed-rate debt	355,781,000	374,299,000
Contract value of foreign exchange forward contracts outstanding	110,000,000	161,500,000
Fair Value Hedges, Net	0	0
Senior notes, 6.875%, due June 2023	375,000,000	375,000,000
Fair Value, Transfers Between Levels, Amount	0
Fair Value, Inputs, Level 1 [Member]
Assets recorded at fair value:
Foreign exchange forward contracts	0	0
Liabilities recorded at fair value:
Foreign exchange forward contracts	0	0
Liabilities not recorded at fair value:
Long-term fixed-rate debt	0	0
Fair Value, Inputs, Level 2 [Member]
Assets recorded at fair value:
Foreign exchange forward contracts	802,000	1,818,000
Liabilities recorded at fair value:
Foreign exchange forward contracts	1,349,000	1,576,000
Liabilities not recorded at fair value:
Long-term fixed-rate debt	355,781,000	374,299,000
Fair Value, Inputs, Level 3 [Member]
Assets recorded at fair value:
Foreign exchange forward contracts	0	0
Liabilities recorded at fair value:
Foreign exchange forward contracts	0	0
Liabilities not recorded at fair value:
Long-term fixed-rate debt	$ 0	$ 0