Benefit Plans - Changes in Projected Benefit Obligation and Components of Net Periodic Pension Costs (Detail) - USD ($)	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
U.S. Pension Plan
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	$ 58,731,000	$ 58,330,000
Service cost	450,000	400,000	$ 250,000
Interest cost	2,232,000	2,311,000	2,340,000
Actuarial loss (gain)	2,327,000	862,000
Administrative expenses paid	(395,000)	(461,000)
Benefits paid	(2,786,000)	(2,711,000)
Projected benefit obligation, end of period	60,559,000	58,731,000	58,330,000
Change in plan assets:
Fair value of assets, beginning of period	49,992,000	47,031,000
Benefits paid	(2,786,000)	(2,711,000)
Administrative expenses paid	(395,000)	(461,000)
Actual return on plan assets	5,138,000	3,133,000
Contributions	1,000,000	3,000,000
Fair value of assets, end of period	52,949,000	49,992,000	47,031,000
Funded status at end of period	(7,610,000)	(8,739,000)
German Pension Plan
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	24,166,000	23,545,000
Interest cost	426,000	529,000	523,000
Actuarial loss (gain)	(91,000)	1,157,000
Benefits paid	(1,233,000)	(1,104,000)
Currency adjustment	2,976,000	39,000
Projected benefit obligation, end of period	26,244,000	24,166,000	$ 23,545,000
Change in plan assets:
Benefits paid	(1,233,000)	(1,104,000)
Contributions	0	0
Funded status at end of period	$ (26,244,000)	$ (24,166,000)