Benefit Plans - Changes in Projected Benefit Obligation and Components of Net Periodic Pension Costs (Detail) - USD ($)	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
U.S Pension Plan [Member]
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	$ 58,330,000	$ 55,262,000
Service cost	400,000	250,000	$ 250,000
Interest cost	2,311,000	2,340,000	2,429,000
Actuarial losses (gains)	862,000	4,280,000
Administrative expenses paid	(461,000)	(359,000)
Benefits paid	(2,711,000)	(729,000)
Settlements	0	(2,714,000)
Projected benefit obligation, end of period	58,731,000	58,330,000	55,262,000
Change in plan assets:
Fair value of assets, beginning of period	47,031,000	51,085,000
Actual return on plan assets	3,133,000	(252,000)
Contributions	3,000,000	0
Fair value of assets, end of period	49,992,000	47,031,000	51,085,000
Funded status at end of period	(8,739,000)	(11,299,000)
German Pension Plan [Member]
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	23,545,000	28,434,000
Service cost	0	0	40,000
Interest cost	529,000	523,000	801,000
Actuarial losses (gains)	1,157,000	(40,000)
Benefits paid	(1,104,000)	(1,069,000)
Currency adjustment	39,000	(4,303,000)
Projected benefit obligation, end of period	24,166,000	23,545,000	$ 28,434,000
Change in plan assets:
Contributions	0	0
Funded status at end of period	$ (24,166,000)	$ (23,545,000)