Employee Benefit Plans - Narrative (Detail) (USD $)	12 Months Ended
	Jan. 31, 2013 Item	Jan. 31, 2012	Jan. 31, 2011
Employee Benefit Plans [Line Items]
Expense for defined contribution plans	$ 3,962,000	$ 4,107,000	$ 4,347,000
Maximum percentage of participant's salary that may be deferred under a deferred compensation plan	25.00%
Maximum percentage of participant's bonus that may be deferred under a deferred compensation plan	50.00%
Employee deferrals, including employer matching contributions	1,273,000	1,974,000	1,499,000
Liability for deferred compensation	12,377,000	11,201,000
Number of multiemployer defined benefit pension plans under the terms of collective-bargaining agreements	33
Contributions to multiemployer plans and union pension expense	3,157,000	3,133,000	3,568,000
Net periodic pension cost	1,430,000	1,133,000	521,000
Former Chief Financial Officer [Member]
Employee Benefit Plans [Line Items]
Highest number of consecutive years of employment to compute supplemental retirement benefits	5 years
Pension liability recognized in consolidated balance sheets related to supplemental retirement benefits	$ 5,644,000	$ 4,553,000