Valuation and Qualifying Accounts and Reserves (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Accounts receivable allowances: Doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 2,466	$ 4,705	$ 6,286
Additions - Charged to costs and expenses	1,346	1,057	2,065
Additions - Charged to other accounts
Deductions	1,732	3,296	3,646
Balance at end of period	2,080	2,466	4,705
Accounts receivable allowances: Sales returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	9,306	7,078	6,606
Additions - Charged to costs and expenses	3,367	6,465	2,075
Additions - Charged to other accounts
Deductions	5,043	4,237	1,603
Balance at end of period	7,630	9,306	7,078
Allowance for inventory liquidation and obsolescence [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	53,938	48,428	46,234
Additions - Charged to costs and expenses	32,228	30,665	25,608
Additions - Charged to other accounts
Deductions	31,991	25,155	23,414
Balance at end of period	54,175	53,938	48,428
Allowance for inventory shrinkage [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	1,495	1,074	954
Additions - Charged to costs and expenses	2,600	2,502	3,653
Additions - Charged to other accounts
Deductions	2,863	2,081	3,533
Balance at end of period	1,232	1,495	1,074
Deferred tax valuation allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	13,570	22,579	24,433
Additions - Charged to costs and expenses	6,786	1,590	2,408
Additions - Charged to other accounts
Deductions	6,175	10,599	4,262
Balance at end of period	$ 14,181	$ 13,570	$ 22,579