Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Unconsolidated Subsidiaries [Member]
Total
Balance September 1 at Aug. 31, 2010   $ (41,001)
Balance September 1 at Aug. 31, 2010   546
Balance September 1 at Aug. 31, 2010   47,124
Balance September 1 at Aug. 31, 2010   (117,453)
Balance September 1 at Aug. 31, 2010   (20,361)
Balance September 1 at Aug. 31, 2010   503,471
Balance September 1 at Aug. 31, 2010   1,283,890
Balance September 1 at Aug. 31, 2010 (66,297)  
Balance September 1 at Aug. 31, 2010   (15,532)
Preferred stock   0
Common stock    
Exercise of stock options   2,464
Shares exchanged for taxes on stock based compensation   (236)
Tax benefit on stock based compensation   (16)
Stock-based compensation   8,680
Retained earnings    
Net income (loss) attributable to Shaw   (16,003)
Currency translation adjustment    
Change during year   4,060
Equity in unconsolidated entities’ other comprehensive income (loss), net of Shaw’s tax    
Change during year 16,953  
Unrealized gain (loss) on hedging activities    
Change during year   3,270
Unrealized net holding gain (loss) on securities    
Change during year   481
Pension and other postretirement benefit plans    
Change during year   676
Balance November 30 (49,344) (117,205)
Treasury stock at cost    
Purchases under repurchase plans   0
Shares exchanged for taxes on stock-based compensation   (436)
Total Shaw shareholders’ equity at November 30   1,547,156
Noncontrolling interests    
Net income (loss)   753
Distributions to noncontrolling interests   (1,385)
Contributions from noncontrolling interests   600
Adjustment for deconsolidation of VIE(s)   (10,662)
Total equity at November 30   1,583,586
Balance November 30 at Nov. 30, 2010   (40,325)
Balance November 30 at Nov. 30, 2010   1,027
Balance November 30 at Nov. 30, 2010   36,430
Balance November 30 at Nov. 30, 2010   (117,889)
Balance November 30 at Nov. 30, 2010   (17,091)
Balance November 30 at Nov. 30, 2010   487,468
Balance November 30 at Nov. 30, 2010   1,294,782
Balance November 30 at Nov. 30, 2010 (49,344) (117,205)
Balance November 30 at Nov. 30, 2010   (11,472)
Balance September 1 at Aug. 31, 2011   (33,938)
Balance September 1 at Aug. 31, 2011   (50)
Balance September 1 at Aug. 31, 2011   32,147
Balance September 1 at Aug. 31, 2011   (639,704)
Balance September 1 at Aug. 31, 2011   (16,558)
Balance September 1 at Aug. 31, 2011   328,455
Balance September 1 at Aug. 31, 2011   1,321,278
Balance September 1 at Aug. 31, 2011 (50,724) (104,922)
Balance September 1 at Aug. 31, 2011   (3,652)
Preferred stock   0
Common stock    
Exercise of stock options   519
Shares exchanged for taxes on stock based compensation   (50)
Tax benefit on stock based compensation   37
Stock-based compensation   8,157
Retained earnings    
Net income (loss) attributable to Shaw   49,244
Currency translation adjustment    
Change during year   (11,736)
Equity in unconsolidated entities’ other comprehensive income (loss), net of Shaw’s tax    
Change during year (6,321)  
Unrealized gain (loss) on hedging activities    
Change during year   4,758
Unrealized net holding gain (loss) on securities    
Change during year   (17)
Pension and other postretirement benefit plans    
Change during year   598
Balance November 30 (57,045) (117,640)
Treasury stock at cost    
Purchases under repurchase plans   0
Shares exchanged for taxes on stock-based compensation   (21)
Total Shaw shareholders’ equity at November 30   950,275
Noncontrolling interests    
Net income (loss)   1,163
Distributions to noncontrolling interests   (900)
Contributions from noncontrolling interests   3,075
Total equity at November 30   985,760
Balance November 30 at Nov. 30, 2011   (33,340)
Balance November 30 at Nov. 30, 2011   (67)
Balance November 30 at Nov. 30, 2011   35,485
Balance November 30 at Nov. 30, 2011   (639,725)
Balance November 30 at Nov. 30, 2011   (11,800)
Balance November 30 at Nov. 30, 2011   377,699
Balance November 30 at Nov. 30, 2011   1,329,941
Balance November 30 at Nov. 30, 2011 (57,045) (117,640)
Balance November 30 at Nov. 30, 2011   $ (15,388)