Schedule of Certain Financial Statement Captions (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Receivables, net:
Billed and billable receivables	$ 799	$ 775
Unbillable receivables, including contract retentions	305	397
Less allowance for doubtful accounts	(16)	(6)
Receivables, net	1,088	1,166
Inventory, prepaid expenses and other current assets:
Deferred income taxes	89	34
Inventories	59	79
Prepaid expenses	34	32
Prepaid income taxes and tax refunds receivable	24	94
Restricted cash	18	51
Assets held for sale	0	30
Other	32	13
Total inventory, prepaid expenses and other current assets	256	333
Property, plant and equipment, net:
Electric generation facility	269	0
Computers and other equipment	205	268
Leasehold improvements	169	181
Buildings and improvements	113	141
Office furniture and fixtures	44	53
Land	27	27
Construction in progress	0	2
Property, plant and equipment, gross	827	672
Less accumulated depreciation and amortization	(344)	(386)
Property, plant and equipment, net	483	286
Accounts payable and accrued liabilities:
Accrued liabilities	395	435
Accounts payable	218	259
Collections in excess of revenues on uncompleted contracts and deferred revenue	103	88
Total accounts payable and accrued liabilities	716	782
Accrued payroll and employee benefits:
Salaries, bonuses and amounts withheld from employees' compensation	152	196
Accrued vacation	129	152
Accrued contributions to employee benefit plans	5	5
Total Accrued payroll and employee benefits	286	353
Other long-term liabilities:
Accrued pension liabilities	9	8
Deferred compensation	38	40
Liabilities for uncertain tax positions	12	24
Deferred tax liabilities	66	32
Other	102	66
Total other long-term liabilities	$ 227	$ 170