Commitments and Contingencies Rent Expense Under Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Rent Expense	$ 28,114us-gaap_LeaseAndRentalExpense	$ 27,240us-gaap_LeaseAndRentalExpense	$ 26,597us-gaap_LeaseAndRentalExpense

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration