Goodwill - Additional Information (Detail)	9 Months Ended
	Oct. 28, 2012
Water Works
Goodwill [Line Items]
Fair value of reporting units in excess of carrying value	47.00%
Utilities
Goodwill [Line Items]
Fair value of reporting units in excess of carrying value	31.00%
Crown Bolt
Goodwill [Line Items]
Fair value of reporting units in excess of carrying value	6.00%
Repair And Remodel
Goodwill [Line Items]
Fair value of reporting units in excess of carrying value	40.00%
Electrical
Goodwill [Line Items]
Fair value of reporting units in excess of carrying value	116.00%
Minimum
Goodwill [Line Items]
Discount rates used to calculate fair value of reporting unit	11.50%
Fair value inputs EBITDA multiple	6
Maximum
Goodwill [Line Items]
Discount rates used to calculate fair value of reporting unit	14.00%
Fair value inputs EBITDA multiple	7