Stockholders' Equity - AOCI T2 rows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Accumulated other comprehensive loss
Reclassifications, before tax	$ 45	$ 348	$ 726	$ 1,025
Reclassifications, tax (expense) benefit	(8)	(129)	(262)	(379)
Reclassifications, net of tax	37	219	464	646
Other changes, before reclassifications, before tax	(1,137)	(1,520)	(1,807)	(3,810)
Other changes, before reclassifications, tax (expense) benefit	407	556	644	1,392
Total other changes before reclassifications, net of tax	(730)	(964)	(1,163)	(2,418)
Total other comprehensive loss, net of tax	(693)	(745)	(699)	(1,772)
Gain (Loss) on Investments [Member]
Accumulated other comprehensive loss
Reclassifications, before tax	(281)		(281)
Reclassifications, tax (expense) benefit	109		109
Reclassifications, net of tax	(172)		(172)
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss
Reclassifications, net of tax			464	646
Total other changes before reclassifications, net of tax			(1,163)	(2,418)
Total other comprehensive (loss) income, before tax	(1,092)	(1,172)	(1,081)	(2,785)
Total other comprehensive income (loss), tax	399	427	382	1,013
Total other comprehensive loss, net of tax	(693)	(745)	(699)	(1,772)
Mark-to-market foreign currency adjustment
Accumulated other comprehensive loss
Other changes, before reclassifications, before tax	(11)	(108)	25	(181)
Other changes, before reclassifications, tax (expense) benefit	3	37	(9)	63
Total other changes before reclassifications, net of tax	(8)	(71)	16	(118)
Mark-to-market fair value adjustment
Accumulated other comprehensive loss
Other changes, before reclassifications, before tax	(39)	(283)	220	(731)
Other changes, before reclassifications, tax (expense) benefit	14	100	(77)	256
Total other changes before reclassifications, net of tax	(25)	(183)	143	(475)
Unrealized Gain (Loss) on Cash Flow Hedges
Accumulated other comprehensive loss
Reclassifications, net of tax			636	646
Other changes, before reclassifications, before tax	(1,087)	(1,129)	(2,052)	(2,898)
Other changes, before reclassifications, tax (expense) benefit	390	419	730	1,073
Total other changes before reclassifications, net of tax	(697)	(710)	(1,322)	(1,825)
Total other comprehensive loss, net of tax			(686)	(1,179)
Unrealized Gain (Loss) on Cash Flow Hedges | Interest Expense [Member]
Accumulated other comprehensive loss
Reclassifications, before tax	326	348	(1,007)	(1,025)
Reclassifications, tax (expense) benefit	117	129	371	379
Reclassifications, net of tax	$ 209	$ 219	$ (636)	$ (646)