Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 29, 2016	Feb. 28, 2015
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Balance - (Beginning of period)			$ 538,551	$ 775,977
Other comprehensive loss before reclassifications	$ (892)	$ (16,025)	(1,901)	(25,009)
Income tax benefit	0	0	0	428
Other comprehensive loss before reclassifications, net of tax	(892)	(16,025)	(1,901)	(24,581)
Amounts reclassified from accumulated other comprehensive loss	101	891	477	1,441
Income tax benefit	(37)	(229)	(132)	(367)
Amounts reclassified from accumulated other comprehensive loss, net of tax	64	662	345	1,074
Total other comprehensive loss, net of tax	(828)	(15,363)	(1,556)	(23,507)
Balance - February 29, 2016 and February 28, 2015 (End of period)	477,072	545,339	477,072	545,339
Foreign Currency Translation Adjustments
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Balance - (Beginning of period)	(35,018)	(17,935)	(34,009)	(10,663)
Other comprehensive loss before reclassifications	(892)	(12,601)	(1,901)	(19,873)
Income tax benefit	0	0	0	0
Other comprehensive loss before reclassifications, net of tax	(892)	(12,601)	(1,901)	(19,873)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Income tax benefit	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Total other comprehensive loss, net of tax	(892)	(12,601)	(1,901)	(19,873)
Balance - February 29, 2016 and February 28, 2015 (End of period)	(35,910)	(30,536)	(35,910)	(30,536)
Pension Obligations, net
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Balance - (Beginning of period)	(4,232)	(2,000)	(4,273)	(2,036)
Other comprehensive loss before reclassifications	0	0	0	0
Income tax benefit	0	0	0	0
Other comprehensive loss before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	101	38	165	87
Income tax benefit	(37)	(15)	(60)	(28)
Amounts reclassified from accumulated other comprehensive loss, net of tax	64	23	105	59
Total other comprehensive loss, net of tax	64	23	105	59
Balance - February 29, 2016 and February 28, 2015 (End of period)	(4,168)	(1,977)	(4,168)	(1,977)
Net Unrealized Gain (Loss) on Cash Flow Hedges
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Balance - (Beginning of period)	0	(850)	(240)	58
Other comprehensive loss before reclassifications	0	(3,424)	0	(5,136)
Income tax benefit	0	0	0	428
Other comprehensive loss before reclassifications, net of tax	0	(3,424)	0	(4,708)
Amounts reclassified from accumulated other comprehensive loss	0	853	312	1,354
Income tax benefit	0	(214)	(72)	(339)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	639	240	1,015
Total other comprehensive loss, net of tax	0	(2,785)	240	(3,693)
Balance - February 29, 2016 and February 28, 2015 (End of period)	0	(3,635)	0	(3,635)
AOCI Attributable to Parent [Member]
Increase (Decrease) In Accumulated Other Comprehensive Loss [Roll Forward}
Balance - (Beginning of period)	(39,250)	(20,785)	(38,522)	(12,641)
Balance - February 29, 2016 and February 28, 2015 (End of period)	$ (40,078)	$ (36,148)	$ (40,078)	$ (36,148)