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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 03, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of inventory
Inventories are summarized as follows:

 
2016
 
2015
Raw materials
$
90,606

 
$
99,129

Work in process
30,872

 
43,907

Finished products
116,149

 
131,789

 
$
237,627

 
$
274,825
Schedule of accumulated other comprehensive income (loss)
Changes in Accumulated other comprehensive loss by component are as follows:
 
Pension Benefits
 
Foreign Currency Translation Adjustments
 
Derivative Financial Instruments
 
Total
Balance at November 30, 2014, net of tax
$
(37,667
)
 
$
(16,413
)
 
$
—

 
$
(54,080
)
Other comprehensive loss before reclassifications and tax
(637
)
(a)
(35,636
)
 
—

 
(36,273
)
   Tax benefit
257

 
—

 
—

 
257

Other comprehensive loss before reclassifications, net of tax
(380
)
 
(35,636
)
 
—

 
(36,016
)
Reclassifications, before tax
3,464

(b)
—

 
—

 
3,464

   Tax expense
(1,420
)
 
—

 
—

 
(1,420
)
Reclassifications, net of tax
2,044

 
—

 
—

 
2,044

Other comprehensive gain (loss), net of tax
1,664

 
(35,636
)
 
—

 
(33,972
)
Balance at November 30, 2015, net of tax
$
(36,003
)
 
$
(52,049
)
 
$
—

 
$
(88,052
)
Other comprehensive (loss) gain before reclassifications and tax
(8,597
)
 
(31,660
)
 
385

 
(39,872
)
   Tax benefit (expense)
3,106

 
21

 
(139
)
 
2,988

Other comprehensive (loss) gain before reclassifications, net of tax
(5,491
)
 
(31,639
)
 
246

 
(36,884
)
Reclassifications, before tax
3,670

(b)
—

 
(108
)
 
3,562

   Tax benefit (expense)
(1,327
)
 
—

 
39

 
(1,288
)
Reclassifications, net of tax
2,343

 
—

 
(69
)
 
2,274

Other comprehensive gain (loss), net of tax
(3,148
)
 
(31,639
)
 
177

 
(34,610
)
Balance at November 30, 2016, net of tax
$
(39,151
)
 
$
(83,688
)
 
$
177

 
$
(122,662
)


(a) Includes gains of $3,988 related to a curtailment and re-measurement of the assets and liabilities of the Company's qualified U.S. pension plan resulting from the disposal of J.L. Clark. See Note L for related information.

(b) Includes amortization of prior service cost and net actuarial loss included in net periodic benefit cost that were reclassified from accumulated other comprehensive loss to selling and administrative expenses. See Note L for related information.
Schedule of uncompleted contracts
Unearned revenue and Unbilled accounts receivable are as follow:
 
2016
 
2015
Unearned revenue
$
7,790

 
$
10,308

Unbilled accounts receivable
1,343

 
4,317